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Velocity of COM

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Find the percentage decrease in acceleration due to gravity when a body is taken from the surface of earth to a height of 64 Km from its surface.

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Q. Find the percentage decrease in the acceleration due to gravity when a body is taken from the surface of earth to a height of

64 k m

from its surface. [Take

R_{e} = 6.4 \times 10^{6} m]

Q. The change in the P.E., when a body of mass

m

is displaced from Earth's surface to a vertical height equal to radius of earth (g

=

acceleration due to gravity on earth surface) is:

g

is the acceleration due to gravity on the Earth' surface, find the gain in potential energy of a body of mass

m

when taken from the surface of Earth at a height equal to the radius

R

At which height from earth surface acceleration due to gravity is decreased by 75% of its value at earth surface?

Q. A body is taken to a height of

n R

from the surface of the earth. The ratio of the acceleration due to gravity on the surface to that at the altitude is

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