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Question

If the units of force, energy and velocity are 10 N, 100 J and 5 m/s then the unit of mass is :

A
1 kg
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B
2 kg
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C
3 kg
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D
4 kg
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Solution

The correct option is D 4 kg
Force=[M1L1T2]=F
Energy=[M1L2T2]=E
Velocity=[LT1]=V
M1αFaEbVc
M=(M1L1T2)a(M1L2T2)b(LT1)c
1=a+b:b+c=1:c=2
0=a+2b+c:(2a+2b)c=0:b=1
0=2a2bc:a=0
Mass=Energy(Velocity)2=100(5)2=4 kg

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