A weightlifter takes 0.5s to raise a barbell with 2 free-weights from the ground to a height of 0.9m. If each free-weight has a mass of 30kg and the barbell has a mass of 20kg, calculate how much power the weightlifter produces when lifting the barbell?

P = 1412.82 [Watt]

Explanation:

First we must calculate the total mass that makes up the barbell and the two free weights at each end of the barbell.

Weight is now defined as the product of mass by gravitational acceleration.

where:

m = mass = 80 [kg]

g = gravity acceleration = 9.81 [m/s²]

Now using the product of the weight by the distance traveled we can calculate the work.

where:

W = work [J]

w = weight = 784.8 [N]

d = distance = 0.9 [m]

And power is defined as the relationship of work at a certain time. The potency is expressed by means of the following formula.