Question

A box is accelerated from rest along a frictionless surface by a net force of 100N. It covers 40 metres in 5 seconds. Find the mass of the box.

Answer 1

Answer: 31,25

Step-by-step explanation:

F= 100

`F=ma`

a=?

x = 40

Vo = 0

We have to evaluate a :

`x = Vot + (1)/(2)at^2\\\\40=0+(1)/(2)a(5^2 )\\\\80=25a\\\\3,2=a`

The force formula :

`F=ma`

`100=m*3,2\\\\31,25=m`