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Subject :NSO    Class : Class 9

A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest

AAt the highest position of the body.
BAt the instant just before the body hits the earth.
CIt remains constant throughout
DAt the instant just after the body is projected.

pl tell answer

Ans 1:

Class : Class 9
C-It remains constant throughout.

Ans 2:

Class : Class 10
C- It must remain constant through out.

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