posted by Sally .
A weight lifter lifts a barbell from the ground, raises it at a constat velocity and holds it motionless over his head. How does the force of the lifter compare with the wieght of the barbell at different stages of the lift?
when the barbell is being lifted its weight is different than when it is stationary
why don't you answer it yourself?
A weight lifter lifts a 550 N weight 1.25 m over his head in 2.5 seconds. What is the power of the weight lifter?