JEE PHYSICS MCQ: GRAVITATION

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A body is projected vertically upwards from the surface of the earth with a speed equal to

\frac{1}{4}

th of escape velocity from surface of earth. Maximum height attained by the body from the surface of the earth will be (

R

-Radius of earth)

View answer and explanation

Correct option: D

\frac{R}{15}

Option D (

\frac{R}{15}

) is correct because the maximum height is found by equating the initial kinetic and potential energy to the final potential energy using conservation of energy.

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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

to the horizontal surface of earth, then the escape velocity would be If different planets have the same density but different radii, then the acceleration due to gravity on the surface of the planet is related to the radius (R) of the planet as Which of the following statement is absolutely correct about mass Statement I: An astronaut in a satellite feels weightlessness:

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