Freefall & Motion

Q.

Among which of the following situations the object(s) is/are in free fall?

1. An object dropped from a certain height.
2. An object is thrown upward or a person jumping off the ground.
3. Flying in a aircraft.
4. A car accelerating at $9.8m{s}^{-2}$in the road.

1. Only 1^st is in free fall.

2. Only 3^rd is in free fall.

3. Only 1^st and 2^nd are in free fall.

4. Only 1^st and 3^rd are in free fall.

Q. A stone is dropped from a cliff. Its speed after it has fallen a distance of 100m is:

1. 19.6 m/s
2. 9.8 m/s
3. 0 m/s
4. 44.2 m/s

Q. If a hammer and a one rupee coin are dropped simultaneously from the top of a tower, which would reach the ground first? (Neglect air/atmosphere)

1. Hammer
2. Coin
3. Both will reach at the same time
4. Insufficient information

Q. Identify the free fall situations from the following.

1. A man landing through a parachute
2. An apple falling on moon
3. A rocket propelling into space
4. A heavy stone falling from a cliff

Q. Brandon Stark saw some suspicious activity at the terrace of a tower. When he reached there, he saw some thieves and hurried back to tell his father. Accidentally, he fell from the top of the tower and landed on the ground exactly 2 seconds later. Find the height of the tower. Take $g=10m{s}^{-2}$

1. 5 m
2. 20 m
3. 15 m
4. 10 m

Q.

In vacuum all freely falling bodies have ____

1. same velocity

2. same acceleration

3. same speed

4. None of these

Q. The velocity of a freely falling body, starting at rest and after one second is ___ m/s. (Round your answer to the nearest integer)

Q. Two objects of different masses falling freely near the surface of moon would experience

1. Different acceleration
2. Forces of same magnitude
3. Same velocity at any instant
4. Change in inertia

Q. A movie scene reads thus : " Katrina is thrown off a cliff by villains. Salman has to save her but he jumps one second later than when she falls." He still saves her since his weight is much more than that of Katrina. Assuming that the day was non-windy, is the scene logically possible ?

1. No
2. Yes

Q.

An object is said to be in a state of free fall when

1. It accelerates under the force of gravity.

2. When the only force acting on it is the weight of the object.

3. Initial velocity can be a zero or a non-zero value.

4. All of these.