Question

When P = 100N and F = 85N, the box accelerates. The mass of the box is 25kg. Calculate the acceleration of the box.

Answer 1

The net force acting on box

$$F_{\rm net}=P-F=100-85=15\:\rm N.$$

The acceleration of the box

$$a=\frac{F_{\rm net}}{m}=\frac{15}{25}=0.6\:\rm m/s^2.$$