Question

during a workout, a football player pushes a blocking dummy a distance of 30 m. while pushing the dummy the same distance a second time, what would the player need to change to be certain that power output increases?
the player would need to use a greater force and take more time.
the player would need to use a greater force and take less time.
the player would need to use a smaller force and take more time.
the player would need to use a smaller force and take less time.

Explanation:

Step1: Recall power formula

Power $P=\frac{W}{t}$, and work $W = F\times d$ (where $F$ is force and $d$ is distance). Given $d$ is constant.

Step2: Analyze how to increase power

To increase $P$, since $P=\frac{F\times d}{t}$ and $d$ is fixed, we need to increase $F$ (force) and decrease $t$ (time).

Answer:

The player would need to use a greater force and take less time.