Question

A ball is gently dropped from a height of 20m.If its velocity increases uniformly at the rate of 10 m/s, with what velocity will it strike the ground? After what time will it strike the ground? (g=10m/s.)
mera answer to 20 m/s and 3s aya h mujhe wrong lg rha h
plz clear my doubt ​

Answer 1

Answer :-

given :- s = 20 m

u = 0 m/s

a = 10 m/s²

To find - Time taken to reach ground

We know that ,

S = ut + 1/2 at²

According to question,

20 = (0)(t) + 1/2 (10)(t)²

20 = 0 + 5t²

t² = 20/5

t² = 4

t = 2 sec

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