Practice Final 1. A painter is standing on a 0.5m tall ladder. After finishing painting the ceiling, he jumps to the ground. a. What is the velocity that he is reaches the ground b. On the first jump, he locks his knees when reaching the floor. It takes him 0.1s to come C. to full stop. What is the acceleration from the point his toe reaches the ground to complete stop. What is the impulse in part B. Compare the acceleration and impulse when he jumps the second time but rather bends his knees taking 1s to fully stop. 2. An arrow is shot from a height of 1.5m towards a target at height H. It is shot with a velocity of 25m/s at an angle of 55. It lands on the target after 4s in the air. What is the height of the target, H? b. What is the maximum height the arrow reaches? With what velocity does arrow hit the target? 3. A 70kg hockey player (at rest) blocks the puck (m=0.15kg) traveling at 75m/s towards him. Assume this is elastic collision an puck bounces back. What are their final velocities? 4. A 55kg skier with an initial velocity of 12m/s coasts up an incline of 2.5m high. The slope is angled at 35 and the coefficient of kinetic friction between skiis and slope is 0.08000. What is her final velocity at the top of slope? KE V 35 4 = ? 2.5 m U und