Question

1. A box of mass 5 kg is accelerated from rest across a floor at a rate of 2 m/s2  for 7 s. Find the net work done on the box.

Answer 1

Given quantities:

$m = 5kg$

$a = 2 \frac{m}{s^2}$

$t = 7s$

$A= FS=mg\frac{at^2}{2}=5*10*\frac{2*49}{2}=2450J$