A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is

Question

Quizplus · Accepted Answer

We can use the formula for power, P = W/t, where W is the work done and t is the time taken. The work done to lift the barbell is given by W = mgh, where m is the mass of the barbell, g is the acceleration due to gravity, and h is the height lifted.

W = (200 kg)(9.81 m/s^2)(2 m) = 3,924 J

Using the time given, t = 2.2 s, we can find the average power developed:

P = W/t = 3,924 J / 2.2 s = 1,783 W or 1.78 kW

Therefore, the best choice is C.

A Weightlifter Raises a 200-Kg Barbell Through a Height of 2