1) 2023 S3 EOY P1 Q26

A girl of weight 600 N runs up a flight of stairs in 12 s.
The vertical height of the flight of stairs is 3.0 m.

What is the average power developed by the girl?

2) A 300 N force is applied to a box to move it up a ramp, as shown.

How much work is done by the force when moving the box from X to Y?

3) A 4.0 kg mass is tied to a 10.0 kg mass and placed on a slope as shown in the diagram below. They are initially held at rest. The frictional force between the 4.0 kg mass and the plane of the slope is 4.0 N. When they are released, what is the kinetic energy gained by the system if the distance moved by the 10.0 kg mass is 2.0 m?

4) A car of mass 1000 kg is moving at 20 m s^–1 along a level road.

When its brakes are applied, the car slows down to 10 m s^–1. How much energy is converted to thermal energy and then lost to the surroundings?

5) Which quantity is calculated by multiplying the magnitude of a force by the distance moved in the direction of the force?