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1: Batter A is likely to hit the ball a greater distance because swinging the bat from a resting position on the shoulder allows for a larger range of motion and build-up of greater momentum compared to Batter B hitting the ball directly behind it.
2: The collision forces between the drum and the drumstick involve the transfer of energy and momentum. When the drumstick strikes the drum, the force of impact causes the drumhead to vibrate, creating sound. The collision forces depend on the speed and mass of the drumstick, as well as the stiffness and surface area of the drumhead.