Next weekend you are going to Eleanor Rigby's house to fix her grandfather clock that is a bit slow. Based on what you have learned about pendulums, how will you fix her slow clock?

By pushing the pendulum Bob up so it moves faster

Explanation:

In pendulum physics the length of the pendulum Bob determines the speed of the clock. So since the grandfather's clock is slow it means the Bob is has moved down so to move it up you have to achieve this by adjusting the but upwards thereby making the clock move faster.