Any help would be appreciated?

Question

1) work of 400J was done in shifting a body horizontally against a resistance of 100N. Find how far the body was moved.

2) A horizontal force shifts a box of mass 40kg a distance of 2m along a rough floor. If the work done is 200J, find the co efficient of friction between the floor and the box.

Answer 1

1) Work = force * distance

400J = 100N * 4 meters

2) 200J = Force * 2m; Force = 100N

40 kg mass * acceleration of gravity (9.8 m/s^2) = 392N of force into the floor.

Force_forward = friction coeff. * Force_normal

100 = mu * 392

0.255 = mu

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