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Q.

A stone is thrown vertically from the ground. It reaches the maximum height of 500 m in 10 sec. After what time it will reach the ground from the maximum height reached?

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a

10 s

b

20 s

c

5 s

d

15 s

answer is B.

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Detailed Solution

Time taken by stone to reach from ground to maximum height is exactly equal to the time taken by it to reach from there back to the ground.

Time of ascent = time of decent
Hence, it is 10 sec.

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