Astudent pulls a cart across a horizontal floor by exerting a force of 50 newton at an angle 30

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.

0.19 m/s and 0.45 m/s

i think the answer is a and b

i wish you luck