Q.

A new system is formed such that it uses force, energy and velocity as fundamental quantities with units 20N, 200J and 5 ms-1. Calculate the unit of mass ( in kg) in this new system

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answer is 8.

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Detailed Solution

F=20N,E=200J,v=5ms−1 Since E=FL⇒L=EF=20020=10m Since v=LT−1⇒ 5=10T−1⇒T=2s  Further F=MLT−2⇒20=M(10)(2)−2⇒M=8010=8kg
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A new system is formed such that it uses force, energy and velocity as fundamental quantities with units 20N, 200J and 5 ms-1. Calculate the unit of mass ( in kg) in this new system