explain Two friends, Joe and Sam, go to the gym together to strength train. They

Question

explain

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 48.0 kg barbell. Joe is taller than Sam which means Joe's arms are 67.6 cm long while Sam's are 60.0 cm. Calculate the work done by Joe, W_Joe when he raises the barbell to finish one repetition. The acceleration Joe due to gravity is 9.81 m/s^2. W_Joe =

Explanation / Answer

We use formula,

Work = Force*distance

WJoe = Weightbarbell*height

WJoe = mbarbell*g*h

WJoe = 48.0*-9.81*0.676

WJoe = 318.0 J

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