1.The velocity of the 170 g hockey puck is m/s. Assume that 200 g is the equivalent mass of the stick concentrated in the blade which contacts the puck. The coefficient of restitution of between puck and blade is 0.6. Find the velocity of the blade of the stick, vs to send the puck to the goal.
2.A woman is pulling a suitcase by exerting a force 40N at an angle of 20 degrees above the horizontal. The suitcase has a mass of 15kg, and a constant friction of 15N opposes the motion. She starts with an initial speed of 0 and moves the suitcase a distance of 20m. Find the speed of the suitcase at the end of the path.