# Motion Under Gravity

## Trending Questions

**Q.**A particle starting from rest travels a distance x in first 2 seconds and a distance y in next two seconds, then

**Q.**A particle is dropped under gravity from rest from a height h(g=9.8msec2) and it travels a distance 9h25 in the last second, the height h is

- 100 m
- 122.5 m
- 145 m
- 167.5 m

**Q.**A particle is moving in a vertical circle such that the tension in the string at the topmost point B is zeroThe acceleration of the particle at point A is(g= 10 m/s2)B2(2) 10/10 m/s(1) 10/5 m/s(4) 5/10 m/s2(3) 10 m/s

**Q.**A car travelling with a speed of 80 km/h slowed down to 44 km/h in 15s. The retardation i

**Q.**15.A stick of mass m and length l is pivoted at one end and is displaced through an angle theta .the increase in potential energy is

**Q.**if velocity of flow is 4 m/s then velocity head is

**Q.**28.What is the difference between change in magnitude of velocity and magnitude of change in velocity

**Q.**An object is dropped from rest from a large height. Assume g to be constant throughout the motion. The time taken by it to fall through successive distances of 1 m each will be

- same, which is √28 seconds
- in the ratio of the square roots of the integers 1, 2, 3, …
- in the ratio of the difference in the square roots of the integers, i.e., √1, (√2−√1), (√3−√2), (√4−√3), ...
- in the ratio of the reciprocals of the square roots of the integers, i.e., 1√1, 1√2, 1√3, ...

**Q.**A particle is projected with a velocity {\vec v=(3^ i-^ j+2^ k)m/s and a constant acceleration { acting on the particle is \vec a=(-6^ i+2^ j-4^ k)m/s Then the path of projectile is

**Q.**Two balls are projected at different angles from the same place and with the same initial speed of 50 m/s.Both have the same range of 216 m. The difference in their times of flight is: (1)14.4 s (2)7.8 s (3)3.6 s (4)0 s

**Q.**Six small rain dropseach of radius 1.5 mm;come down with a terminal velocity of 6 cm/sec .They coalesce to form a bigger drop.what is the terminal velocity of the bigger drop?

**Q.**Give the graph of kinetic energy versus acceleration and also their relation

**Q.**A cricketer hits a ball with a velocity 25m/s at 60 degree angle above the horizontal.how far above the ground it passes over a fielder 50m from the bat??

**Q.**2.A balloon carrying a ball is moving vertically upward with velocity 12m/s when the balloon is at height 65m the ball is dropped with what speed ball hit the ground.

**Q.**6. If the distance b/w two bodies is i creased by a factor of 5 by what factor would the mass of one of them have to be altered to maintain the same gravitational force ?would this be an Increase or decrease in the mass

**Q.**A cricket ball is thrown at a speed of 28 metre per second in a direction 30 degree above the horizontal calculate the maximum height , the time taken by the ball to return to the same level and the distance from the thrower to the point where the ball returns the same level.

**Q.**if ge is the acceleration due to gravity at the equator and gp be the that at the poles. assuming the earth to be a a sphere of radius Re roatating about its own axis with angular speed omega, then ge-gp is ?

**Q.**51. The potential energy of mass m moving in xy plane in aconservative field is given by U=ax+by, where x and y are position coordinates of the object. Find magnitude of its acceleration

**Q.**What should be minimum retardation of car A to avoid collision with car B if B is travelling with constant velocity(v2)?

**Q.**A particle is projected vertically upwards with speed 20 m/s from top of a tower of height 20 m as shown in figure. Given B is top most point of trajectory and C is at same height as A.

List-I gives certain statements regarding particle

List - II gives corresponding results in SI units.

Match the statements in List-I with corresponding results in List-II.

List-IList-II(I)ratio of maximum height from ground (BD)(P)1√2to the initial height from ground (AD) is(II)ratio of distance travelled in 1st second to(Q)1the distance travelled in 2nd second is(III)ratio of initial speed at A to the final(R)2just before reaching to ground (D) is(IV) ratio of time taken from A to C and time (S)3taken from A to B is

- I→R; II→S; III→R; IV→P
- I→S; II→R; III→P; IV→R
- I→R; II→S; III→P; IV→R
- I→P; II→S; III→Q; IV→R

**Q.**The ratio of distances covered by a freely falling body (starting from rest) during the 1st, 2nd, 3rd second of its motion is: [Take g=10 m/s2]

- 3:6:9
- 1:3:5
- 2:3:5
- 1:3:7

**Q.**if velocity is speed in a particular direction and speed is how fast or slow an object is moving then why the formula of speed and velocity diff

**Q.**Write two factors affecting kinetic energy. Also draw a graph between kinetic energy and mass?

**Q.**A body falls from rest under gravity and travels half of its total path in the last second. Find the time of fall in seconds. (Take g=10 ms−2)

**Q.**On an inclined plane inclined at an angle of 30° to the horizontal, a ball is thrown upwards with a velocity of 10 m/s, at an angle of 60° to the inclined plane. Its range on the inclined plane is

**Q.**A ball is projected at an angle of 37degree from the ground with a speed 20 m/s. The maximum height achieved by ball is

**Q.**A particle is projected from ground with speed 80 m/s at an angle 30^0 with horizontal from ground the magnitude of average velocity of particle in time interval t=2s to t=6s is

**Q.**A particle is projected with speed v0 at an angle theta from horizontal the average velocity of particle

**Q.**A body travels half of its total path in the last second of its fall from rest. If t and H are the time and height of its fall (take g=10 m/s2). Then,

- t=2.4 s
- t=3.4 s
- H=28.8 m
- H=58.3 m

**Q.**

I drop a ball from an aeroplane. If there was no air, will the ball still fall at a uniform acceleration ie. in ratios 1:4:9?

YES

NO