An electric motor is used to pull a cart up a ramp. Which information is not needed to calculate the rate at which the motor does work against gravity?
the vertical height of the ramp
the total weight of the cart
the length of the ramp
the time taken for the cart to travel up the ramp
95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.