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Q.

A ball is thrown upwards from the top of a tower of height 40 m with a velocity of 10 ms-1. Find the time when it strikes the ground.

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a

3 s

b

4 s

c

5 s

d

6 s

answer is B.

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Detailed Solution

S=ut+12at2 -40=10t+12(-10)t2 t2-2t-8=0  on solving we get t=4 s and t = -2 s
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A ball is thrown upwards from the top of a tower of height 40 m with a velocity of 10 ms-1. Find the time when it strikes the ground.