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Question

A stone falls from a balloon that is descending at a uniform rate of 12ms1. The displacement of the stone from the point of release after 10 sec is :-

A
490 m
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B
610 m
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C
510 m
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D
725 m
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Solution

The correct option is D 610 m
Given,
u=12m/s, the velocity of the stone is same as ballon
t=10 sec
g=9.8 ms2
From 2nd equation of motion,
s=ut+12gt2
s=12×10+12×9.8×10×10
s=120+490
s=610m
The correct option is B.

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