Answer :
Final answer:
The weightlifter's average power can be calculated by dividing the work done by the time taken to lift the weight. The correct answer is (a) 1960 W.
Explanation:
To find the average power expended by the weightlifter, we need to use the formula for power: power = work / time. In this case, the work done is equal to the force multiplied by the distance: work = force * distance.
The force exerted by the weightlifter is equal to the weight of the object being lifted: force = mass * gravity, where gravity is approximately 9.8 m/s^2.
Using the given values, the force is 240 kg * 9.8 m/s^2 = 2352 N. The distance lifted is 2.5 m. Plugging these values into the formula, we get the work done: work = 2352 N * 2.5 m = 5880 J. Finally, dividing the work by the time taken (3 seconds) gives us the average power: average power = 5880 J / 3 s = 1960 W.
Therefore, the correct answer is (a) 1960 W.
