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A man throws a ball straight upward with speed 30 m/s from the top of a...

A man throws a ball straight upward with speed 30 m/s from the top of a building that is 75 m high. Ignore air resistance and choose the vertical y-axis to be positive downward with origin at the point of throw (top of the building).

  • Represent the initial velocity and the acceleration vectors in the reference y-axis above.
  • Find the maximum height the ball reaches with respect to the ground.
  • How long does it take the ball to reach the ground?
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Answer #1

Find the maximum height and time required using equation of kinematics for vertical motion under influence of gravity and taking upward as positive direction as shown below

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