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A 1 kg mass is projected down a rough ci...

A 1 kg mass is projected down a rough circular track (radius = 2 m) placed in vertical plane as shown. The speed of the mass at point P is 3 m/s and at point Q is 6 m/s. How much work is done on the mass between points P and Q by the force of friction? (Take `"g = 10 m/s"^2`)

A

`-7.5` J

B

`-8.5` J

C

`-6.5` J

D

`-24` J

Text Solution

Verified by Experts

The correct Answer is:
C
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