A box weighing 100 newtons is pushed up an inclined plane that is 5 meters long. It takes a force of 75 newtons to push it to the top, which has a length of 3 meters.

80%.

Explanation:

Question didn't state what is being looked for, but then

Weight of the box, w = 100 N.

Length of the plane, L = 5 m

Force used, = 75 N

Length pushed through, = 3 m

Looking at the stated parameters, the first thing that comes to mind is to look or calculate for the efficiency of the machine.

Tha efficiency can be gotten by using the relation

Change in energy divided by work done. This is gotten by saying

(100 * 3) / (5 * 75) =

300/ 375 = 0.8

Therefore, the efficiency of the machine has been calculated to be 80% or 0.8

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c) up is the direction the magnetic force is acting on the charge.