A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4.8 m/s, but 2.7 s later at the bottom of the slope, its speed is 22.7 m/s. What is its average acceleration?
A) 6.96 m/s²
B) 8.00 m/s²
C) 10.00 m/s²
D) 12.59 m/s²
