A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 m s-, find: (a) the inital velocity of the ball (b) the final velocity of the ball on reaching the ground and (c) the total time of journey of the ball.
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Answer:
a) 20 m/s
b) 20 m/s
c) 4 seconds
Explanation:
a) The initial velocity of the ball is 20m/s :
As it reaches a maximum height of 20m
and the acceleration is 10m/s^2.
So in order to reach a height of 20m , with an acc. in opp. direction it has to move with 20m/s
b) 20m/s
As the velocity of any object thrown upward with some speed lands on the ground with the same speed
c) use v=u+at
0=20-10t
»t=2 sec
but this is the time it reaches the max. height
so it will take 2 more sec to reach the ground
» Time = 4 sec
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