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STATEEMNT-1 : Work done by frictional fo...

STATEEMNT-1 `:` Work done by frictional force is always either negative or zero.
because
STATEMENT-2 `:` Work done by the static friction on a system may be zero.

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The correct Answer is:
D
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STATEMENT-1 Work done by static friction in any reference frame is zero STATEMENT-2 If work done on the body is positive its kinetic energy increases.