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Q.

A stone is dropped from the top of a tower of height h. After 1s another stone is dropped from the balcony 20m below the top. Both reach the bottom simultaneously. What is the value of h? Take g=10 ms-2.

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a

3125m

b

312.5m

c

31.25m

d

25.31m

answer is C.

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Detailed Solution

h=12gt2 and h-20=12g(t-1)2Solving them we get, t = 2.5 s and h = 31.25 m
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