A man through A ball vertically upward it rises through 20m and returned to his hands .what was the initial velocity to the ball and for how much time it remained in the air ( g = 10 m/s2
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At the top v =0
v² = u² + 2as
0= u² +2 × -10 × 20
-u²= -400
u² = 400
u = 20 m/s
v = u + at
0 = 20 -10t
10t= 20
t = 2 seconds to reach the top
total time taken= 2+2 = 4
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