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4. In which of the following cases forces may not be required to keep the

(a) Particle going in a circle

(b) Particle going along a straight line

(c) The momentum of the particle constant

(d) Acceleration of the particle constant

ANSWER: c

(11)

5/5 - (5 votes)

PrevPrevious3. A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

Next5. A wagon weighing 1000 kg is moving with a velocity 50km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now isNext

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