1. An apple falls from a tree and reaches the ground in 6 seconds, with a velocity of 60 m/s toward the ground. What is the acceleration?
2. An astronaut is working outside the space station. Using her jet pack, she accelerates toward the entrance from a stop. Her thrusters fire for 5 seconds and give her a velocity of 10 m/s toward the entrance of the space station. What is her acceleration?
3. A runner in a track and field event sprints for 5 seconds at an acceleration of 9 m/s2. Calculate ∆v.
4. A subway train pulls away from the station and begins moving toward its next stop with an acceleration of 7.5 m/s2. What is the change in the train’s velocity during the first 9 seconds of its trip?
5. A wrecking ball suspended from a crane breaks loose and falls to the ground with an acceleration due to gravity of 10 m/s2 downward. It hits the ground with a velocity of 35 m/s downward. How long did it take to hit the ground?
6. A speedboat is moving across the lake. The driver notices that the speedboat is on a collision course with a sailboat! The driver accelerates at a rate of 7 m/s2 away from the sailboat and adds 28 m/s to his speed. A collision was avoided. How long did he accelerate for?