Physics

Ruby Harris

21 February, 22:43

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 39.0 kg barbell. Joe is taller than Sam which means Joe/'s arms are 67.8 cm long while Sam/'s are 59.8 cm. Calculate the work done by Joe, WJoe, when he raises the barbell to finish one repetition. The acceleration due to gravity is 9.81 m/s2.