Two friends, joe and sam, go to the gym together to strength train. they decide to start off with an exercise called flat bench press. lying flat on a bench with their arms in an extended position, they slowly lower (to their chest) and then raise a barbell back to the starting position. they start off by using a 31.5 kg barbell. joe is taller than sam which means joe's arms are 68.6 cm long while sam's are 60.8 cm. calculate the work done by joe, w_joe, when he raises the barbell to finish one repetition. the acceleration due to gravity is 9.81 m/s^2.
remember does the exercise. how does the amount of work sam does, w_sam, lifting the weight the correct operator from the list below.
w_sam = w_joe
w_sam > w_joe
wsam < w_joe