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

Explanation:

F=  100

$F=ma$

a=?

x = 40

Vo = 0

We have to evaluate a :

$x = Vot + \frac{1}{2}at^2\\\\40=0+\frac{1}{2}a(5^2 )\\\\80=25a\\\\3,2=a$

The force formula :

$F=ma$

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