1.

A block weighing `40N` travels down a smooth fixed curved track `AB` joined to a rough horizontal surface (figure). The rough surface has a friction coefficient of `0.10` with the block. If the block starts slipping on the track from a point `2.0m` above the horizontal surface, the distance it will move on the rough surface is `:-` A. `40m`B. `20m`C. `15m`D. `10m`

Answer» Correct Answer - B
Apply work enery theorem `W_(1)+W_(2)=DeltaKE`
`rArr-umgS+mgh=0rArrS=(2)/(0.1)=20m`


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