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प्रश्न
Calculate the kinetic energy of a body of mass 100 g and having a momentum of 20 kgms−1.
संख्यात्मक
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उत्तर
Convert the mass into kilograms: 100 g = 0.1 kg
Using \[ \text{K.E.} = \frac{p^{2}}{2m} \]
\[= \frac{(20)^{2}}{2\, (0.1)} \]
\[= \frac{400}{0.2} \]
= 2000 J
Therefore, the kinetic energy is 2000 J.
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