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Standard XII

Physics

Second Law of Motion

The mass of a...

Question

The mass of a goods lorry is $4000 k g$ and the mass of goods loaded on it is $20000 k g$ . If the lorry is moving with a velocity of $2 m / s$ what will be its momentum?

48000 k g m / s

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48 k g m / s

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4.8 k g m / s

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None

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Solution

The correct option is A $48000 k g m / s$
Given : $m_{1} = 4000$ kg $m_{2} = 20000$ kg $v = 2$ m/s
Total mass of the 'lorry + goods' system $M = 4000 + 20000 = 24000$ kg
$∴$ Total momentum of the system $P = M v = 24000 \times 2 = 48000$ $k g$ $m / s$

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The mass of a goods lorry is 4000 kg and the mass of goods loaded on it is 20000 kg. If the lorry is moving with a velocity of 2 m/s what will be its momentum?

The correct option is A 48000 kg m/sGiven : m1=4000 kg m2=20000 kg v=2 m/sTotal mass of the 'lorry + goods' system M=4000+20000=24000 kg∴ Total momentum of the system P=Mv=24000×2=48000 kg m/s

The mass of a goods lorry is $4000 k g$ and the mass of goods loaded on it is $20000 k g$ . If the lorry is moving with a velocity of $2 m / s$ what will be its momentum?

The correct option is A $48000 k g m / s$
Given : $m_{1} = 4000$ kg $m_{2} = 20000$ kg $v = 2$ m/s
Total mass of the 'lorry + goods' system $M = 4000 + 20000 = 24000$ kg
$∴$ Total momentum of the system $P = M v = 24000 \times 2 = 48000$ $k g$ $m / s$