Question

A person of mass 80 kg stands on Earth's surface. What is his weight?

89 N

480 N

784 N

980 N

Answer 1

The weight of the person on the Earth's surface is 784N

Solution:

The weight and mass are separate things. The weight of the person includes the gravitational acceleration along with the mass of the person as per Newton’s second law.

So,
`Weight = Mass* GravitationalAcceleration`

Here the mass = 80 kg

We know the gravitational acceleration =
`9.8 m/sec^2`

So the weight of the person =
`Mass * Gravitational acceleration = (80*9.8)N = 784N`

Answer 2

784N

Step-by-step explanation:

Yo need to multiply the mass of the person by th Earth's gravity, which we know is 9.8m/s²

80kg*9.8m/s² = 784N