Q.
A piece of ice of mass 50 kg is pushed with a velocity of 5 m/s along a horizontal surface. As a result of friction between the piece and the surface, the piece stops aftertravelling 25 m; the ice melted in this process is:
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a
50 kg
b
50 g
c
7.86 g
d
1.86 g
answer is D.
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Detailed Solution
Ice melted =12MV2Lf=12(50)(5)280×4.2×1000=0.00186 kg=1.86 g.
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