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Direction of Instantaneous Velocity

what change y...

Question

what change you will find in the potential energy of a body when a conservative force does positive work on it ?

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Solution

The potential energy of the body will decrease.

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Q. When a conservative force does positive work on a body

Q. A body is freely moving under the action of a conservative force. If the work done by this conservative force is 'a', change in kinetic energy 'b' & magnitude of change in potential energy is 'c', then

Q. Assertion :If work done by conservative forces is positive, kinetic energy will increase. Reason: Here potential energy will decrease.

Underline the correct alternative :

(a) When a conservative force does positive work on a body, the potential energy of the body increases / decreases / remains unaltered.

(b) Work done by a body against friction always results in a loss of its kinetic / potential energy.

(c) The rate of change of total momentum of a many-particle system is proportional to the external force / sum of the internal forces on the system.

(d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy / total linear momentum / total energy of the system of two bodies.

Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J and this force does a positive work on the body.

Statement 2: A force does a positive work on an object when the displacement is in the direction of force itself.

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