A 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 4 m.The power expended in raising the 50-kg sack compared to the power used to lift the 25-kg sack is

Question

Quizplus · Accepted Answer

The work done on both sacks is the same (force x distance), as they both were lifted the same amount of work: (50 kg x 9.8 m/s^2 x 2 m) = (25 kg x 9.8 m/s^2 x 4 m) = 980 J.

Power is work done per unit time, and since the work done is the same but the distance covered and time are different for both sacks, the power expended in lifting them should be the same. Therefore, the power expended in raising the 50-kg sack is the same as the power required to lift the 25-kg sack, and the answer is C - the same.

A 50-Kg Sack Is Lifted 2 M in the Same