Use \(g=10\text{ m s}^{-2}\).

A 25 kg box is pulled 12 m up a rough plane inclined at \(8^\circ\), along a line of greatest slope, against a frictional force of 50 N. The pulling force is parallel to this line. The box starts from rest and ends at speed \(2.4\text{ m s}^{-1}\). Find the work done by the pulling force. [4]