1a) A ball is thrown in the -y direction off of a cliff with a velocity of 7m/s. If the ball takes 1.45s to reach the ground, how high off of the ground is the cliff? (Answer: -20m)

1b) What is the velocity of the ball just before it reaches the ground? (Answer: -21m/s)

2) A rocket with an engine that causes a net acceleration of 4m/s^2 launches with an initial velocity of 20m/s. The engine fuel lasts for 0.8s. A secondary engine then fires causing a net acceleration of 2m/s^2 for 0.6s. How far off of the ground is the rocket when the secondary rocket runs out of fuel? (Answer: 31.6m)

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