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Q.

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

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a

3125 m

b

312.5 m

c

31.25 m

d

25.31 m

answer is C.

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Detailed Solution

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