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Calculate the magnitude of the force FB in the back muscles that is needed to support the upper body plus the box and compare this with his weight. The mass of the upper body is 55.0 kg and the mass of the box is 30.0 kg.

Respuesta :

Answer:

807.5N

Explanation:

The combined mass (m) on the back muscle is 55kg + 30kg = 85kg

Acceleration due to gravity (g) = 9.8m/s²

Therefore the force FB = ma = 85*9.8

FB= 807.5N

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