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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
- Option 1)
at the highest position of the body
- Option 2)
at the instant just before the body hits the earth
- Option 3)
it remains constant all through
- Option 4)
at the instant just after the body is projected
Answers (2)
As discussed in
Power if the force is constant -
- wherein
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.
Option 1)
at the highest position of the body
This solution is incorrect
Option 2)
at the instant just before the body hits the earth
This solution is correct
Option 3)
it remains constant all through
This solution is incorrect
Option 4)
at the instant just after the body is projected
This solution is incorrect
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