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Q.

A block of ice of mass 50 kg is pushed out on a horizontal plane with a velocity of 5 m/s. Due to friction, it comes to rest after covering a distance of 25 m. How much ice melts?

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a

1.86 g

b

1.43 g

c

1.33 g

d

1.75 g

answer is A.

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Detailed Solution

We havem=WJL=mv22JL=50×252×4.2×80=1.86gwhere L is the latent heat of ice (80 cal/g).
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