Question

2. The mass of a person is 70 kg. What is the weight?
A) 7 N
B) 700 kg
C) 7 kg
D) 700 N

Answer 1

Explanation:

Weight is the force of gravity on an object. Therefore the equation for this is:

F = ma

with a = 9.8 m/s2

To determine the weight of a 70 kg person, we substitute in the values:

Weight = F = 70 kg x 9.8 m/s2 = 686 kg(m)/s2

The unit kg(m)/s2 is also known as a Newton. So the person's weight would be 686 N.