Question

A boy is of mass 40 kg. If the pull of
gravity on 1 kg on the surface of earth
is 9.8 N and at the surface of moon is
1.6 N, find (a) the weight of boy at the
earth's surface, (b) mass and weight of
the boy at the moon's surface.​

Answer 1

Explanation:

please follow the picture attached

Answer 2

Given

Mass of the body = 40 kg

find a] The weight of the boy at the earth's surface.

       b] The mass and weight of the boy at the moon's surface

Solution

a) At the earth's surface,

Weight= 40Kgf

Since 1 Kgf = 9.8 N,

Weight = 40* 9.8N = 392 N

Therefore the weight of the boy at the earth's surface is 392 N

Solution

b] At the moon's surface

Mass of boy will remain same as at the earth surface = 40kg

But 1 kaf = 1.6N

so weight = 40* 1.6 N = 64 N

Therefore the weight of the boy at the moon's surface is 64 N