Q1) What is the acceleration of a car that travels in a straight line at a constant speed?

Q2) A roller coaster car rapidly picks up speed as it rolls down a slope. 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 its average acceleration?

Q3) During the final minute of Beck's last race, he was running with an initial velocity of 3.0m/s and accelerated at a rate of 0.02m/s² for 60s. What was his final velocity?

Q4) Justine starts walking at 4m/s and accelerates at a rate of -0.2m/s². How much time does it take her to reach a velocity of 1.5m/s?