Ken Griffey, Jr., hits a baseball so that it has an initial velocity of 45 m/s at an angle 30 degrees above the horizontal.
Describe the acceleration of the ball as it flies through the air.
Answer: The ball maintains a constant speed in the horizontal direction. -> acceleration in the x-direction = 0 The ball accelerates constantly in the vertical direction, due to gravity: -> acceleration in the y-direction = -9.8 m/s^2
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