4. A 180 kg sumo wrestler on roller skates, rolling at 5 m/s to the left, collides elastically with another sumo wrestler of mass 215 kg who is rolling at 3.5 m/s to the right on his roller skates. If
the speed of the 180 kg wrestler after the collision is 2 m/s in his original direction, what is the
speed of the second wrestler?

m1u1+m2u2=m1v1+m2v2

Explanation:

m1=180

m2=215

u1=5

u2=3.5

v1=2

v2=?

use the above formula

what is the question because that is not a question.

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.