A roller coaster car rapidly picks up velocity as it rolls down a slope. As it starts down the slope, its speed is 8 m/s but after 5 seconds, its velocity is 23 m/s. What would the acceleration of the car be? Group of answer choices 3 m/s/s 2 m/s/s 6 m/s/s 5 m/s/s

3m/s/s

Explanation:

initial velocity=8m/s

Final velocity=23m/s

Time=5s

Acceleration=change in velocity/time

=(23-8)m/s÷5s

=15m/s÷5s

=3m/s/s

answer( sicar );

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.