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Yogita Ingle 5 years, 7 months ago
Let us assume, the final velocity with which ball will strike the ground be ‘v’ and time it takes to strike the ground be ‘t’
Initial Velocity of ball, u =0
Distance or height of fall, s =20 m
Downward acceleration, a =10 m s-2
As we know, 2as =v2-u2
v2 = 2as+ u2
= 2 x 10 x 20 + 0
= 400
= Final velocity of ball, v = 20 ms-1
t = (v-u)/a
´Time taken by the ball to strike = (20-0)/10
= 20/10
= 2 seconds
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