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Question

A stone falls from a balloon that is descending at a uniform rate of 12 m/s. The magnitude of the displacement of the stone from the point of release after 10 sec is


A

490 m

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B

510 m

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C

610 m

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D

725 m

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Solution

The correct option is C

610 m


u = -12m/s, g = - 9.8 m/sec2, t = 10sec

Displacement = ut+12gt2

= 12×10+12×9.8×100=610m (since downwards)

The magnitude is 610m.


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