Question

A roller coaster car rapidly picks up speed as it rollsdown a slope. As it starts down the slope its speed is 4m/s. But 3 seconds later, at the bottom of the slope, its speed is 22m/s. What is its average acceleration?

Answer 1

Given:
u = 4 m/s, initial speed
v = 22 m/s, final speed
t = 3 s, time

Let a = the average acceleration, m/s²
Use the formula
v = u +at
22 = 4 + 3a
18 = 3a
6 = a

Answer: 6 m/s²