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A ball is dropped vertically from a height of 100m and it's velocity is 5m/s.then find the time taken to reach the ground?

A ball is dropped vertically from a height of 100m and it's velocity is 5m/s.then find the time taken to reach the ground?

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Grade:9

1 Answers

Khimraj
3007 Points
4 years ago
Just  apply second equation of motion
h = ut + ½gt2
100 = 5t + 5t2
t2 + t -20 =0
(t+5)(t-4) =0
t = -5(not possible) , 4
SO t = 4 sec
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