Please explain- Ie: #1-a #2-b #1 A ball rolling rapidly along a tabletop rolls o

Question

Please explain- Ie: #1-a #2-b #1 A ball rolling rapidly along a tabletop rolls off the edge and falls to the floor. At the exact instant that the first ball rolls off the edge, a second ball is dropped from the same height. Which ball, if either, reaches the floor first? Explain. A) The rolling ball reaches the floor first because it has an initial velocity and the dropped ball does not. B) The dropped ball reaches the floor first because its velocity is only in the y-direction. C) Both balls reach the floor at the same time because they both have the same initial zero y-component of velocity. #2 A ball is thrown straight upward. At the very top of its flight, the velocity of the ball is zero. Is its acceleration at this point also zero? Explain. A) Yes, the acceleration is zero because the velocity is also zero. B) Yes, the acceleration is zero because the ball is thrown straight upward. C) No, the acceleration due to gravity is constant even at the top of its flight. D) No, the acceleration is decreasing but will not be zero until the ball lands on the ground. #3 A cannonball fired at an angle of 70

Explanation / Answer

The vertical velocity will be the same for each ball, since acceleration due to gravity is constant. However, the first ball with also have a horizontal velocity remaining from when it was rolling on the table. So the first ball will have a larger total velocity, because it has the extra horizontal componen

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