Question

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Answer 1

Answer:

Work energy theorem states that the change in kinetic energy of an object is equal to the net work done on it by the net force.

Let us suppose that a body is initially at rest and a forceSyntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.is applied on the body to displace it throughSyntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. along the direction of the force. Then, small amount of work done is given by

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Also, according to Newton’s second law of motion, we have

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where a is acceleration produced (in the direction of force) on applying the force. Therefore,

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Now, work done by the force in order to increase its velocity from u (initial velocity) to v (final velocity) is given by

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Hence, work done on a body by a force is equal to the change in its kinetic energy.

Answer 2

Answer:

The work-energy theorem states that the work done by the net force acting on a body is equal to the change produced in the kinetic energy of the body. Let F be the variable force. According to Newton's law, F=ma.