Question

A 40 kg person sits on top of a 400 kg rock. What is the person’s weight? 390 N

440 N
3500 N
3900 N
4290 N

Answer 1

The weight of the person is given by:

W = mg

W = weight, m = mass, g = gravitational acceleration

Given values:

m = 40kg, g = 9.81m/s²

Plug in and solve for W:

W = 40(9.81)

W = 390N