Q3 of 46 Page 246

The momentum of a massive object at rest is _______.

Momentum is given by the product of mass and velocity. Since the body is at rest, velocity is zero. Hence, momentum is zero.

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1

The acceleration in a body is due to ___________.

i) balanced force ii) unbalanced force


iii) electro static force

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The physical quantity which is equal to the rate of change of momentum is

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The mass of a person is 50 kg. The weight of that person on the surface of the earth will

be ________.

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The freezing of biotechnology products like vaccines require ________ freezing system.