A weight lifter bench‑presses a 150.0 kg 150.0 kg barbell from his chest to a height equal the length of his arms, 0.850 m. 0.850 m. How much work does he do?

1249.5 J

Explanation:

Given,

Mass of the barbell = 150 Kg

height of the lift = 0.850 m

Work done = ?

Work done = F. s

Force = m g

= 150 x 9.8 = 1470 N

W = 1470 x 0.850

W = 1249.5 J

Hence, the work done to lift the barbell is equal to 1249.5 J