PLEASE HELP ILL BRAINLIEST IF ANSWERED CORRECTLY

1. A car advertisement states that a certain car can accelerate from rest to 80 km/h in 7 seconds. Find the car’s average acceleration.


2. A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 5 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?


3. A roller coaster is moving at 35 m/s at the bottom of a hill. Four seconds later it reaches the top of the hill moving at 10 m/s. What was the acceleration of the coaster?