Jojo, a weight lifter, raises a 150 kg barbell from the floor to a height of 2.2 m in 0.80 s . What is the average power output during the lift.

Expert Answers info

justaguide eNotes educator | Certified Educator

calendarEducator since 2010

write12,544 answers

starTop subjects are Math, Science, and Business

Jojo lifts a barbell with a mass of 150 kg from the floor to a height of 2.2 m in 0.8 seconds.

The weight of the barbell is 150*9.8 = 1470 N. This is the force that has to be applied to lift the barbell.

The work done when a force of 1470 N is applied over a distance of 2.2 m is 1470*2.2 = 3234 J

As the barbell is lifted from the ground to a height of 2.2 m in 0.8 s, the power exerted is 3234/0.8 = 4042.5 W

Jojo exerts a power of 4042.5 W to lift the 150 kg barbell a height of 2.2 meters in 0.8 seconds.

check Approved by eNotes Editorial