A roller coaster car is initially at rest at the top hill of its track. The car descends the frictionless track and acquires a speed of 10 m/s when it reaches bottom of the hill. Find the speed of the car when it is half-way down the hill?

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.

a sonic boom is a loud boom that breaks the sound barrier

explanation:

this would be about 43%

k2s for potassium sulphide