Mechanics | Relativity Answers

A car moving at 70 km/h rams into an immobile steel wall. Its front is compressed by 0, 94 m. What average force must a seat belt exert in order to restrain a 75 kg passenger?

Pls explain the ans to the question which i am gonna ask below in the simplest way actually this concept only fears me and i am completely afraid of physics
My question is
What is normal force is it a form of electromagnetic force
If yes then how
You can explain me by example of book resting on table
Bec i dont understand what is happeninh with the book
What forces are actually acting on
Mg or normal force or electromagnetic force

What is velocity

https://isaacphysics.org/questions/gcse_ch2_13_q13?board=92398d11-6559-45dd-a194-62c9e4f264e3

why chemical potential of a photon gas is zero

A boy pull a wagon with a Force of 45N by means of a rope that makes an angle of 40 degree with the ground.how much work does he do in moving the wagon.

A rabbit run across a parking lot. The coordinate of the rabbits as a function of time t are x=0.3t square +7.2t square+28 Y=0.22t square-9.1t+80 with the in seconds and x and y in meters. At the =15s, what is the rabbits position vector r in unit vector notation and as magnitude and an angle

You have an adjustable, wooden incline and want to know how large of an angle would you need to raise the incline before several objects will slide down the incline. Determine the angles where the following object will begin to slide down the incline

A particle p1 is projected vertically upwards from horizontal ground, with a speed of 30m/s.At the same constant another particle p2 is projected vertically upwards from the top of a tower of height 25m,with a speed of 10m/s. Find the time for which p1 is higher than the top of the tower

a man whose mass is 100kg climbs a tree in 20 seconds and expends a power at 150 watts. how tall is the tree