Question

1. four weightlifters in a competition lift the same amount of weight the same distance. which weightlifter produces the most power? weightlifter c lifts the weight in 1 second. weightlifter b lifts the weight in 0.5 seconds. weightlifter a lifts the weight in 2 seconds. weightlifter d lifts the weight in 1.5 seconds.

Explanation:

Step1: Recall power formula

Power is defined as $P = \frac{W}{t}$, where $W$ = work done, $t$ = time.

Step2: Note work is constant

All weightlifters do equal work: $W = mgh$, same $m,g,h$.

Step3: Relate power to time

Since $W$ is fixed, $P \propto \frac{1}{t}$ (smaller $t$ = larger $P$).

Step4: Compare time values

0.5 s < 1 s < 1.5 s < 2 s. Weightlifter B has the smallest time.

Answer:

B. Weightlifter B lifts the weight in 0.5 seconds.