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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

(18)

5/5 - (8 votes)

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