A block is released from rest from top of a rough curved track as s...

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A block is released from rest from top of a rough curved track as shown in figure. It comes to rest
\( \mathrm{P} \) at some point on the horizontal part. If its mass

W is \( 200 \mathrm{gm} \), calculate work by friction in joules.
\( (1)+2 \mathrm{~J} \)
(2) \( -2 \mathrm{~J} \)
(3) \( +4 \mathrm{~J} \)
(4) \( -4 \mathrm{~J} \)
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