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Question

Two stones are dropped down simultaneously from different heights. At the starting time, the distance between them is 30 cm. After 1 s, the distance between the two stones will be :
(g = 10 m s2).

A
10 cm
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B
20 cm
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C
30 cm
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D
0 cm
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Solution

The correct option is C 30 cm
Initial speed of the stones u=0
Distance covered by each stone in t=1 s, S=ut+12gt2
S=0+12gt2=12gt2
Or S=12(10)(1)2=5 m
Thus both the stones cover same distance in time t=1 s.
Hence distance between them after 1 s will be same as the initial distance between them i.e. 30 m.

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