A spring with spring constant 1000 N/m is compressed then launches a 0.50-kg blo

Question

A spring with spring constant 1000 N/m is compressed then launches a 0.50-kg block along a frictionless track that has a 0.40-m long rough spot (k=0.60) in it before encountering a loop the loop of diameter 0.20 m, after which the block collides and sticks to a 1.2-kg block and the two are projected vertically upward to point E. If the center of mass of the block's elevates by 0.40 m, ...

-Find the work done to the block by friction.

A spring with spring constant 1000 N/m is compressed then launches a 0.50-kg block along a frictionless track that has a 0.40-m long rough spot (muk=0.60) in it before encountering a loop the loop of diameter 0.20 m, after which the block collides and sticks to a 1.2-kg block and the two are projected vertically upward to point E. If the center of mass of the block's elevates by 0.40 m, ... -Find the work done to the block by friction.

Explanation / Answer

by conservation of energy,
work done by friction = -.6*.5*9.8*.4 = -1.176J

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