A block of mass m = 0.1 kg is released from a height of 4 m on a curved smooth surface. On the horizontal surface path AB is smooth and path BC offers coefficient of friction μ μ = 0.1. If the impact of block with the vertical wall at C be perfectly elastic, the total distance covered by the block on the horizontal surface before coming to rest will be (take g = 10ms -2 )
Text Solution
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KE attained by block at B = mgh = 4J
Work done by friction force on path BC = ( μ μ mg) (BC) = 0.2 J
On the other horizontal surface block can make total forward and backward
trips. but last time it will stop at B
∴ ∴ Distance covered = 20 × × (AB + BC) − − AB = 59 m.
Hence the correct choice is
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