The graph shows the variation with distance x of the magnitude of the net force F acting on a body initially at rest.

Which of the following describes how the kinetic energy and the acceleration of the body change
with distance?

C

The candidates were clear that the acceleration was decreasing – so had linked this conceptually with the decreasing force. Around half of candidates perhaps confused acceleration with velocity and decided the kinetic energy must also be decreasing.

This question is modelling what happens when an arrow is fired and as such it will be obvious that the speed is increasing while the arrow is in contact with the string.