The grommets on your shoe (Holes through which you place the lace) act as the pulley. When you tighten at the top it restricts at the bottom and compresses around your foot.
The same can be applied to a pulley; If you have the proper set up Pulling one string causes two actions; the first being the most obvious. And the second being its effect. The Grommets of your shoe are the pulley's; while your Shoelaces are just the rope with which you operate the pulley.
The correct answer is (a.) diffuse. The reflection of light waves from a rough surface is called DIFFUSE reflection. This type of reflection reflects light diffusely mostly from a surface that is a non-absorbing material such as plaster and polycrystalline.
The Force exerted on the student is 100 N
<u>Explanation:</u>
Given data
mass= 40 kg
acceleration= 2.5 m/s2
To find the force, we have the formula
Force= mass × acceleration
Force= 40 ×2.5
Force=100 N
The Force exerted on the student is 100 N