The work done by friction is 37.5 J.
According to the work energy theorem, the work done by the friction will be equal to the kinetic energy of the sled.
The kinetic energy of the sled is calculated by the formula
KE=[tex] \frac{1}{2}mv^{2} [/tex]
=0.5*3*5^2
=37.5 J
Therefore the work done the friction is 37.5 Joule.
