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प्रश्न
The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. What will be the kinetic energy of this bullet in kJ?
संख्यात्मक
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उत्तर
Given:
Mass of bullet (m) = 20 g = `20/1000` kg = 0.02 kg
Momentum (p) = 10 kg . m/s
Use the formula relating Kinetic Energy and Momentum:
KE = `p^2/(2m)`
= `10^2/(2 xx 0.02)`
= `100/0.04`
= 2500 J
Convert Joules into kilojoules (KJ):
KE = `2500/1000`
= 2.5 kJ
The kinetic energy of the bullet is 2.5 kJ.
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