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6. A man whose mass is 82 kg pushes a block with amass of 45 kg along a horizontal plane. The dynamic coefficient of friction between the block and plane is 0.2. Assuming that the block is moving at a constant speed, calculate the work required to move the block a distance of 30 m considering the following:

a. The man

b. The block as the system

Express your answers in both N.m and Joules.

Fig: 1

Fig: 2