Question

A roller coaster car rapidly picks up speed as it

rolls down a hlope. As it starts down the slope,
its speed is 4 m/s. But 3 seconds later, at the
bottom of the slope, its speed is 22 m/s. What is
the car’s acceleration?

Answer 1

Acceleration = (change of speed) / (time for the change)

Change in speed = (22 - 4) = 18 m/s.
Time for the change = 3 sec.

Acceleration = 18/3 = 6 m/s per second.