1.1. Higher Tier Only

A student throws a tennis ball vertically upwards and catches it as it returns to her.

Figure 1 shows the motion of the ball whilst it is in the air. 

Figure 1

Draw a free-body force diagram of the ball at position C.

1.2. Higher Tier Only

Explain the motion of the ball in terms of the forces acting upon it at each position throughout its journey.

1.3. One force that acts on the ball is weight. This force is part of a force pair obeying Newton's third law. 

Describe the other force in the pair.