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A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest A At the highest position of the body. B At the instant just before the body hits the earth. C It remains constant throughout D At the instant just after the body is projected. kindly explain why option b and d are different.acc to me the power should be the same in both cases

A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest 

AAt the highest position of the body. 
BAt the instant just before the body hits the earth. 
CIt remains constant throughout 
DAt the instant just after the body is projected.
kindly explain why option b and d are different.acc to me the power should be the same in both cases

Grade:9

1 Answers

Arun
25750 Points
5 years ago

Power exerted by a force P = F.v

The power exerted by the gravitational force is greatest and the instant just before the body hits the earth.

 

hence option B is correct

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