Question

A ball is thrown vertically upward . it goes to a height 20 m & then returns to the ground . taking acceleration due to gravity to be 10 m p s square , find a) initial velocity of ball b) final velocity of ball on reaching the ground c) the total time of journey of ball

Answer 1

a)use u^2/2g=have and find u

b)-u=v due to identical motion

Or v=u in downward direction

c)time taken to reach height h is

t=root of (2h/g)

So total time=2t