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Select the correct alternatives :...

Select the correct alternatives :

A

Work done by static friction is always zero

B

Work done by kinetic friction can be positive also

C

Kinetic enery of a system can not be increased without applying any external force on the system

D

Work energy theoram is valid in non-inerial frames also.

Text Solution

Verified by Experts

The correct Answer is:
B, D
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