A) Find the tension in the Achilles tendon and the force that the tibia exerts on the ankle joint when a person who weighs 614 N supports himself on the ball of one foot. The normal force N = 614 N pushes up on the ball of the foot on one side of the ankle joint, while the Achilles tendon pulls up on the foot on the other side of the joint.

FAchilles= _____ N

Ftibia= ____N

B) Body A of mass 3 kg is moving in the +x-direction with a speed of 15 m/s. Body B of mass 5 kg is moving in the -y-direction with a speed of 7 m/s. What are the x- and y-components of the velocity of the center of mass of the two bodies?

vcmx= _____ m/s

vcmy=_____ m/s

C.) Two identical pucks are on an air table. Puck A has an initial velocity of 3.7 m/s in the positive x-direction. Puck B is at rest. Puck A collides elastically with puck B and A moves off at 1.5 m/s at an angle of +60° above the x-axis. What is the speed and direction of puck B after the collision? (Let angles above the +x-axis to be positive and below to be negative.)

Magnitude=

Direction=

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