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ICSE Class 10 Physics 2018 Paper

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Question : 10 of 78
Marks: +1, -0
Name the unit of physical quantity obtained by the formula   2Kv2\; \frac{2K}{v^2}. Where KK : kinetic energy, v:v: Linear velocity.
Solution:  
The given expression
  =  2Kv2\;=\;\frac{2K}{v^2}
  =  2×12mv2v2(∵K=12mv2)\;=\;\frac{2 \times \frac{1}{2} m v^2}{v^2} \left(\because K = \frac{1}{2} m v^2\right)
  =m   (i.e. mass)   \;=m \; \text{ (i.e. mass) } \;
The unit of mass is kg\mathrm{kg}.
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