(a)[1]
Calculate the waterskier's weight.
(b)[2]
Mass and weight are measured in different units. State two more differences between mass and weight.
(c(i))[2]
A boat pulls the waterskier to the right with a horizontal force of $50\,\text{N}$. The waterskier moves at constant speed. Explain, in terms of the horizontal forces acting, why the speed remains constant.
(c(ii))[3]
The horizontal force to the right rises from $50\,\text{N}$ to $70\,\text{N}$. The magnitudes of the other forces do not change. Calculate the acceleration of the waterskier.