A horizontal force of 160 N is used to push a 55.0-kg packing crate a distance of 8.00 m on a rough horizontal surface. If the crate moves at constant speed, find (a) the work done by the 160-N force and (b) the coefficient of kinetic friction between the crate and surface. Please show your work not only answer.

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The answer is trial 3.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

That big glowy thing in the sky is called the sun