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Q.

A stone is dropped from a certain height which can reach the ground in 5 s. It is stopped after 3 s of its fall and then it is again released. The total time taken by the stone to reach the ground will be

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a

6s

b

6.5s

c

7s

d

7.5s

answer is C.

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Detailed Solution

Here h=12×10×(5)2=125m In 3s it falls through: h1=12×10×(3)2=45m Rest 80m is covered in 4s. Hence, total time taken is 3s+4s=7s
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