A body projected vertically from the earth surface reaches a height equal to earth's radius before returning to the earth. When will be the power exerted by the gravitational force is greatest ?
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a
At the highest position of the body
b
At the instant just before the body hits the earth
c
It remains constant all through
d
At the instant just after the body is projected
answer is B.
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Detailed Solution
Power, P=F→⋅ν→=FνcosθJust before hitting the earth θ=0o. Hence, the power exerted by the gravitational force is greatest at the instant just before the body hits the earth.