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Select the correct option(s)....

Select the correct option(s).

A

(a) A single external force acting on a particle necessarily changes its momentum and kinetic energy.

B

(b) A single external force acting on a particle necessarily changes its momentum.

C

(c) The work-energy theorem is valid for all types of forces: internal, external, conservative as well as non-conservative.

D

(d) The kinetic energy of the system can be increased without applying any external force on the system.

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
Single force on a particle may change the magnitude and or direction of velocity, so momentum changes necessarily but kinetic energy may or may not change.
From work-energy theorem,
`DeltaK=W_(ext)+W_(i nt)+W_(conservative) +W_(NC)`
Kinetic energy can be increased due to work done by internal forces also.
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