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NEET 2011
Exam
NEET
Year
2011
Subject
Physics
Chapter
Gravitation

NEET 2011 · Physics · Gravitation

A body projected vertically from the earth reaches a height equal...

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

Options

  1. Aat the instant just before the body hits the earth
  2. Bit remains constant all through
  3. Cat the instant just after the body is projected
  4. Dat the highest position of the body

Correct answer

A. at the instant just before the body hits the earth

Step-by-step solution

We know P=F→⋅v→=\overrightarrow{\mathbf{F}} \cdot \overrightarrow{\mathbf{v}}=F y \cos θ\thetaSo just before hitting θ\theta is zero and both FF and vv are maximum.
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