Question

There is one body in space which has mass
thrice as that of the earth and a radius four
times as that of the earth. If the weight of a
book on earth is 80 N, what will be its weight
on that body?
[2 M]​

Answer 1

Answer:

Weight = 15 N

For explanation, refer to the attachment.

Note:

Sorry for a little blur picture, the camera is just not working properly :(

Answer 2

Answer:

The weight of book on that planet or body is 15N