Question

A cart loaded with bricks has a total mass
of 28.5 kg and is pulled at constant speed by
a rope. The rope is inclined at 28.1 ◦ above
the horizontal and the cart moves 13.9 m on
a horizontal floor. The coefficient of kinetic
friction between ground and cart is 0.4 .
The acceleration of gravity is 9.8 m/s2 .
How much work is done on the cart by the
rope?
Answer in units of kJ.