Question

Please HELP! Many points! How much work does a weightlifter do if he lifts a 400 Newton barbell 3 meters high- 15 times???

Answer 1

Work = (force) x (distance)

1 time:   (400 newtons) x (3 meters)  =  1,200 joules

15 times:  (1,200 joules) x (15)  =  18,000 joules