Question

Whatis the gravitational potential energy of a 25 kg rock perched at the top of a 100meter cliff?
A..25 J
B.25.5 J
C.2500 J
D.24,500 J

Answer 1

Answer:

answer is

Explanation:

ANSWER

Gravitational potential energy is given by

PE=−

R

GMm

=−4×10

9

But R=10

7

and PE=−4×10

9

J

⇒GMm=4×10

9

×10

7

=4×10

16

Now the weight of the satellite at a radius of 10

9

m from earth's centre is given by,

mg=

R

2

GMm

=

10

18

4×10

16

=4×10

−2

N

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