1.

A block is released from rest from top of a rough curved track as shown in figure. It comes to rest at some point on the horizontal part. If its mass is 200 gm, calculate work by friction is joules A. `+2J`B. `-2J`C. `+4J`D. `-4J`

Answer» Correct Answer - A

BY WORK ENERGY THEOREM

Wf+Wmgh=KEf-KEi

Wf+Wmgh=0(because kinetic energy at start and at end is zero)

Wf=-Wmgh

Wf=-200*10*2/1000

Wf=-4J



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