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25. A rocket can go vertically upwards in earth’s atmosphere because

a) It is lighter than air

(b) Of gravitational pull of the sun

(c) It has a fan which displaces more air per unit time than the weight of the rocket

(d) Of the force exerted on the rocket by gases ejected by it

Ans. d

(20)

5/5 - (8 votes)

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Next26. At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking g = 10 m/s ^2Next

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