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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
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
  • ✓
    Of the force exerted on the rocket by gases ejected by it
✓

Answer

Correct option: D.
Of the force exerted on the rocket by gases ejected by it
d
In accordance with Newton's $3^{rd}$ 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.It flies along a path at an angle to the earth's surface which places the payload in an orbit around the earth.

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