Question

A person performs a bench press. The bar's mass is 40 kg. When this person's arms are extended, the bar is 0.6 m above the starting point. How much work did the person do to push the bar off his chest to full extension of his arms

Answer 1

The work done by the person is 235.2 J.

Work done by the person

The work done by the person is calculated as follows;

W = mgh

where;

• m is mass of the bar
• height through which the bar is raised

W = 40 x 9.8 x 0.6

W = 235.2 J

Thus, the work done by the person is 235.2 J.

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