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Question

An object is dropped from an altitude of one Earth radius above Earth's surface. If M is the

mass of Earth

and R is its radius the speed of the object just before it hits Earth is given by:

A. sqrtGM/R

B. sqrtGM/2R

C. sqrt2GM/R

D. sqrtGM/R2

E. sqrtGM/2R2

Top Answer

Speed of the object just before it hits the earth is:... View the full answer

New Doc 2020-01-05 21.21.06.jpg

initial
R
final
R
At initial point
K. E. = 0
P. E. = - 9Mm
( in = mass of object )
2R
At final point
K.E. = 1 my2
2
P. E. = - 9Mm
R
Total change in energy = 0
AK.E. + AP. E. = 0
[ K . E. final - K....

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