Question

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Answer 1

VERIFIED ANSWER:-

Work done by gravity depends only on the vertical displacement of the body. It does not depend upon the path of the body. Therefore, work done by gravity is given by the expression,

W= m g h

Where,

Vertical displacement, h = 0

ˆ´ W= mg — 0 = 0

Hence, the work done by gravity on the body is zero.

Answer 2

$\Large{\underbrace{\sf{\purple{Required\:Answer:}}}}$

⛦ Given :-

 

• Mass m kept on table, m = 10 kg

⛦ To find :-

• Work done on the object by the gravitaional force =??

⛦ Solution :-

Displacement of mass from A to B is horizontal.

Force of gravitation acts vertically downwards.

That is, force acts perpendicular to displacement.

∴ W = Fs cos 90° = 0. 

⟼Work done on the object by the gravitaional force is 0.

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Extra to know:-

According to Newton law of universal gravitation, every point mass attracts every other point mass by a force directed along the line connecting the two. The gravitational force is an internal force. Since, the two particles are initially at rest, their centre of mass is also initially at rest under the effect of internal forces, so the centre of mass remains in the state of rest.Power is defined as rate of change of energy in a system or the time rate of doing work.

$p = \frac{dE}{dt }$

$\: \: \: \: = \frac{dW}{dt}$

Also work = force × displacement =F×d

In a circular motion, displacement is zero, therefore,

P=

$p = \frac{d}{dt} (f \times d) \\ \: \: \ = \frac{d}{dt} (0) = 0$

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