AIPMT PRELIMS2011Physics-Work, Energy and Power
AIPMT PRELIMS 2011 Physics Power MCQ Question
Type: MCQ-conceptual-Medium-Class 11
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 instant just after the body is projected
B
At the highest position of the body
C
At the instant just before the body hits the earth
D
It remains constant all through
Correct Answer
Option C
Detailed Explanation
Power P is given by P = F ⋅ v = Fv cos θ. Just before hitting, θ is zero and both F and v are maximum, making the power greatest.
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