A racing car reaches a speed of 45 m/s. At this instant, it begins a uniform deceleration
using a parachute and a braking system, and
comes to rest 3.1 s later.
Find the acceleration of the car.
Answer in units of m/s
2
.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

ill do it for 100, also this isnt 80 its 40

it becomes positively charged by charging it

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.