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A brick weighing 4.0 kg is dropped into...

A brick weighing `4.0 kg ` is dropped into a `1.0m` deep river from a height of `2.0m`. Assuming that `80%` of the gravitational potential energy is finally converted into thermal energy, find this thermal energy in calorie.

A

`15`

B

`17`

C

`23`

D

`27`

Text Solution

Verified by Experts

The correct Answer is:
C
`W=JHimplies(80)/(100)(mgh)=JQ`
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