A bullet of mass 4.2xx10^(-2) kg, moving...

A bullet of mass `4.2xx10^(-2)` kg, moving at speed of `300" ms"^(-1)`, gets stuck into a block with a mass 9 times that of the bullet. If the block is free to move without any kind of friction, the heat generated in the process will be

45 cal

405 cal

450 cal

1701 cal

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