Question

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
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Answer 1

Answer:

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

Explanation:

D) of the forces exerted on the rocket by gases ejected by it

Answer 2

option d). the force exerted on the rocket by gases ejected by it.

In accordance with Newton's 3rd Law of Motion the exhaust exerts an equal and opposite force on the rocket which propels it upward enabling it to overcome the gravitational force of the earth. The output of a rocket engine is measured in 'thrust'.

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