Question

A boy weighs 400 N. What is his mass?

Answer 1

`~~40.8 \ "kg"`

Explanation:

Well, assuming the boy is on Earth, then the gravitational acceleration is approximately `9.8 \ "m/s"^2`.

So, we get:

`m=W/g`

`=(400 \ "N")/(9.8 \ "m/s"^2)`

`~~40.8 \ "kg"`