A ball is thrown along the vertical. The coordinate of the ball is observed as a function of time y(t). We choose y = 0 at the ground. The ball is at y = 13.2 m at time t = 0, and at y = 5.0 m at time t = 3.2 s. a) Find the displacement and average velocity of the ball between t = 0 and t = 3.2 s. b) Find the initial and final velocity of the ball. c) What is the height of the ball’s peak above ground? d) What is the average speed of the ball between t = 0 and t = 3.2 s?
The ball is thrown with a velocity from at and it reaches to at .
Displacement of ball
Negative sign indicates the displacement in downward direction.
Average velocity of ball
(In downward direction )
Using equation and substituting the values,
which means ball is thrown in vertically upward direction.
Using and substituting the values,
which means ball is moving downwards.
At maximum height ,
Using equation and substituting the values,
Average speed
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