1. A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 m /s2. He reaches the ground at the rate of 3 m /s. At what height, did he bail out ?
2. A balloon is ascending at the rate of 9m/s at a height of 80 m above ground Now a packet is dropped from the balloon , It will reach ground in: (assume g= 10 m/s2)
3. A boy throws a ball vertically upward with a speed of 40 m/s and it reaches the maximum height H , If he throws the same ball vertically downward from a height of H with initial speed of 40m/s , The ball will reach ground with speed nearly:
4. A body is thrown upward and after some time the body reaches its maximum height, At maximum height:
5. A ball is released from the top of a tower of 8 h metres. It takes T seconds to reach the ground. What is the position of the ball in T / 3 seconds ?
6. A juggler is throwing the ball vertically upward at intervals of 2 seconds. He throws one when the previous one is a the highest point , Then the maximum height to which each ball rises is:( assume g= 10m/s2)
7. Two bodies situated at different height from ground starting falling freely under gravity. The times of the fall of the two bodies are 1 s and 2 s respectively , If g=9.8 m/s2 , The the initial vertical separation between the two bodies is:
8. A body dropped from a height ‘h’ with an initial speed zero reaches the ground with a velocity of 3Km/hr , Another body was dropped from the same height h with an initial speed 4 km/hr , At what velocity will the body reach when it reaches the ground?
9. A man in a balloon rising vertically with an acceleration of 4.9 m s-2 releases a ball 2 seconds after the balloon left ground , The maximum height above the ground reached by the ball is:
10. A stone is thrown upward from the top of a tower with some initial speed and it reaches the ground in t1seconds , Now it is allowed to fall with the same initial speed downward and it reaches ground in t2 seconds , In how much time will it reach the ground if the stone is just released with 0 initial speed and allowed to fall freely under gravity from the same place?