Question 1 (1 point) There were 3 friends that decided to race their bikes down a hill without peddling. They all approached the top of the hill with a velocity of 2m/s. When they got down to the bottom of the hill 15 seconds later, they had achieved a velocity of 15m/s. To their surprise, they all made it down at the same time. What was their acceleration? a 1.15 m/s2 b 7.5 m/s2 c .87 m/s2 d 1 m/s2 Question 2 (1 point) What is the acceleration of a 450 horsepower race car if the car had a mass of 1000Kg and began at a velocity of 10m/s. After 1.75 sec., the car has a velocity of 45m/s? a 10 m/s2 b 25.71 m/s2 c 4.5 m/s2 d 20 m/s2 Question 3 (1 point) A car going 75 mph (35 m/s) hits a wall and comes to a stop. It takes 1.25 s for the car to come to a stop. What is the acceleration of the car? a -60 m/s2 b 60 m/s2 c -28 m/s2 d 28 m/s2 Question 4 (1 point) An Olympic skier starts from rest the top of a hill, accelerating down the hill until he comes to a turn 12 seconds later. his velocity at the turn is 55 m/s, what was his acceleration when he got to the turn? a -.22 m/s2 b .22 m/s2 c 4.58 m/s2 d -4.58 m/s2 Question 5 (1 point) A boy rolls a tennis ball down the hallway and it takes 4.5 seconds to come to a stop. If the ball started with a velocity of 17m/s, what was the acceleration of the ball? a 3.78 m/s2 b -3.78 m/s2 c -4.5 m/s2 d 0 m/s2