How many changes of state are shown? 0 1 2 3
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The given question is incomplete. The complete question is as follows.
You throw a ball vertically upward, and as it leaves your hand, its speed is 26.0 m/s.
(a) How high (in m) does it rise above the level where it leaves your hand?
(b) How long (in s) does it take to reach its highest point?
(c) How long (in s) does the ball take to return to the level where it left your hand after it reaches its highest point?
(d) Assume that the upward direction is positive and the downward direction is negative. What is the ball's velocity (in m/s) when it returns to the level where it left your hand? (Indicate the direction with the sign of your answer.)
Explanation:
(a) For maximum height, the formula will be as follows.
a =
or, h =
=
=
= 34.5 m/s
Hence, it rises 34.5 m/s above the level where it leaves your hand.
(b) Time to reach maximum height is as follows.
v = u + at
or, v - gt = 0
t =
=
= 2.6 sec
Therefore, it will take 2.6 sec to reach its highest point.
(c) Time taken by the ball to ascent is equal to the time it has taken to descent.
Therefore, time taken by the ball to return to the level where it left your hand after it reaches its highest point? is also 2.6 sec.
(d) Speed of the ball will be 26 m/s in the downward direction. Hence, the velocity will be -26 m/s.
The ball will decelerate as it moves upwards.
The magnitude of the ball's acceleration is 0.3 m/s² and it directed backwards.
The given parameters;
- initial velocity of the ball, u = 1.25 m/s
- time of motion of the ball, t = 4.22 s
As the ball rolls up the inclined plane, the velocity decreases and eventually becomes zero when the ball reaches the highest point of the plane.
Thus, the ball decelerate as it moves upwards.
The acceleration of the ball is calculate as;
<em>at the highest point on the incline plane, the final velocity </em><em> is zero</em>
Thus, the magnitude of the ball's acceleration is 0.3 m/s² and it directed backwards.
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