Test Preparation on Gravitation-II-Physics Test Series For NEET 2020

A planet in a distant solar system is 10 times more massive
than the earth and its radius is 10 times smaller. Given that
the escape velocity from the earth is 11 km s-1, the escape
velocity from the surface of the planet would be-

A body of mass ‘m’ is taken from the earth’s surface to the
height equal to twice the radius (R) of the earth. The change
in potential energy of body will be