1. A sled is being pulled along a horizontal snowy path by means of a horizontal rope attached to its front end.  The sled has a mass of $5.6kg$, and as it moves it experiences a constant resistance to motion of magnitude $3.2N$.  The sled starts at rest and accelerates at a constant rate, and after 6 seconds it has reached a speed of $1.5m{s}^{-1}$.

Use the information given along with the suvat equation $v=u+at$ to determine the acceleration of the cart.