A body projected vertically from the earth reaches a height equal to earth’s radius

⇦

⇨

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

(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

Correct Answer:

at the instant just before the body hits the earth

Explanation:

Power exerted by a force is given by P = F.v. When the body is just above the earth’s surface, its velocity is greatest. At this instant, gravitational force is also maximum. Hence, the power exerted by the gravitational force is greatest at the instant just before the body hits the earth.

Related Questions:

1. If α (current gain) of transistor is 0.98, then what is the value of β
2. A particle is executing SHM along a straight line. Its velocities at distances
3. If light emitted from sodium bulb is passed through sodium vapour,
4. What is the energy of He⁺ electron in first orbit?
5. α-particles, deuterons and protons of same energy are moving in a perpendicular

Topics: Work Energy and Power (94)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends