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Calculate the velocity with which a piec...

Calculate the velocity with which a piece of ice at - `5^(@)C` be thrown against a wall so that its entire mass melts upon contact. Latent heat of ice = 80 cal `g^(-1)`, specific heat of ice = 0.5 cal `g^(-1).^(@)C^(-1)`. And `J=4.2 xx 10^(7)` erg `cal^(-1)`.

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The correct Answer is:
`832.5 ms^(-1)`
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