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Section 2: Communication (10 marks) 3. Two footballs are kicked from the ground with equal initial speeds. Ball A is launched at a greater angle above the horizontal than ball B. (a) Determine which ball reaches a higher elevation. (b) Determine which ball stays in the air longer. (5 marks) 4. You are swinging your keys at the end of a lanyard in a horizontal circle around your head. What is the effect on the magnitude of the centripetal acceleration of the keys in each case? (5 marks) (a) You keep the radius of the circle constant but half the speed. (b) The speed of the keys stays the same, but you triple the radius of the circle.