A tennis ball is hit into the air and moves along an arc. (a) Neglecting air res

Question

A tennis ball is hit into the air and moves along an arc.
(a) Neglecting air resistance, where along the arc is the speed of the ball a minimum ? (Select all that apply.)
at the initial position of motion
at the highest point in the trajectory
at the final position of motion


Justify your answer.
(b) Neglecting air resistance, where along the arc is the speed of the ball a maximum? (Select all that apply.)
at the initial position of motion
at the highest point in the trajectory
at the final position of motion


Justify your answer.

Explanation / Answer

a) at the highest point of the motion, the velocity is minimum.
at all point, the horizontal velocity is unchanged, so for thetotal velocity is minumum , the vertical velocity must be zero.
b) similar to part a, now the vertical velocity must be maximum,since it is decrease when it fly up, and increase back when it flydown, the maximum should be at the initial and the end.

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