Free Fall
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If we drop three watermelons weighing 2 kg, 4 kg and 6 kg respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)
Watermelon weighing 4 kg
Watermelon weighing 2 kg
All three will reach at the same instant.
Watermelon weighing 6 kg
A body is dropped from a certain height at time T=0. It undergoes freefall and reaches the ground at time T=t s. What is the expression for the height h from which the body started its free fall?
Acceleration due to gravity is g.
h=gt2
h=gt
h=(12)gt−2
h=12gt2
- equator
- south pole
- centre
- north pole
- 19.6m
- 39.2m
- 78.4m
- 101.4m
A body is thrown up with an initial velocity of 10 m s−1. It reaches a maximum height, h. Find the value of h. [Take acceleration due to gravity, g=10 m s−2]
10 m
15 m
5 m
20 m
A ball is thrown vertically upwards at speed of 20 m s−1. Find the time taken by the ball to reach back to the original position. [Take acceleration die to gravity, g=10 m s−2]
6 s
4 s
3 s
10 s
- Continuously decreases
- Continuously increases
- First increases then decreases
- First decreases then increases
- Displacement in increasing linearly from the beginning
- Displacement increases linearly after certain time
- Displacement remains constant throughout the process
- None of the above
- distance
- speed
- time
- none of these
- n2
- n
- 2n−1
- 2n2−1