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A block of mass 100g slides on a rought ...

A block of mass `100g` slides on a rought horizontal surface .If the speed of the block decreases from `10ms^(-1) to 5ms^(-1)`, find the thermal energy developed in the process

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The correct Answer is:
C
Thermal energy developed `= change in K.E.
`= (1)/(2) xx (100)/(1000) xx 100- (1)/(2) xx (100)/(1000) xx 25`
= 5 - ((5)/(4)) = (15)/(4) = 3.75J`
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