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प्रश्न
A lead pellet of mass 4 g leaves an air gun with a velocity of 50 ms−1. What is the magnitude of potential energy stored by the spring of air gun?
संख्यात्मक
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उत्तर
Given mass = 4 g \[= \frac{4}{1000}\ \mathrm{kg} \]
Velocity (v) = 50 m s−1
∴ Kinetic energy of pellet \[= \frac{1}{2}\, mv^{2} \]
\[= \frac{1}{2} \times \frac{4}{1000} \times 50 \times 50 \]
= 5 J
Now, potential energy = kinetic energy = 5 J
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