JEE PHYSICS MCQ: GRAVITATION

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Two satellites of same mass are launched in the same orbit of radius

r

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is

View answer and explanation

Correct option: A

-\frac{2 G M m}{r}

Option A (

-\frac{2 G M m}{r}

) is correct because after the inelastic collision, the kinetic energy is zero, and the total energy is just the potential energy of the combined mass.

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The escape velocity for a body projected vertically upwards from the surface of the earth is

11.2\mathrm{\;\;km}{\mathrm{s}^{ - 1}}

. If the body is projected in a direction making an angle of

{45^0}

with the vertical, the escape velocity will be The escape velocity of a body projected from the surface of earth is

v_e

. If the body is projected at an angle

\theta

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