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A block is re...

Question

A block is released from rest from top of a rough curved track as shown in the figure. It comes to rest at some point on the horizontal part. If its mass is $200 g$ , calculate the negative of work done (in joules) by friction.

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Solution

Mass of the block $m = 200 g$

Initial and final velocity of block zero.
$(W o r k d o n e)_{n e t f o r c e} = Δ K . E$
$W_{f} + W_{g} = 0 \Rightarrow W_{f} = - W_{g} = - m g h$
$= - 0.2 \times 10 \times 2$
Final answer: $(4) .$

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