Which is having a higher value of momentum: A bullet of mass 10 kg moving with a velocity of 400 metre per second or a cricket ball of mass 400 grams thrown with a speed of 90 km per hour?
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Momentum= mass* velocity
In first case,
Mass of bullet=10 g=0.01 kg
Velocity of bullet= 400 m/s
Hence, momentum= 400*0.01 = 4 kg m/s
In second case,
Mass of cricket ball=400 g3 0.4 kg
Velocity of cricket ball = 25 km/h = 25*5/18 m/s = 125/18 m/s
Hence, momentum=0.4* 125 / 18=25/9 =2.8 kg m/s Since 4>2.8,
Momentum of a bullet> momentum of cricket ball.
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