Answer:
<em>n =1.33 revolutions</em>
Explanation:
<u>Uniform Circular Motion</u>
The angular speed can be calculated in two different ways:

Where:
v = tangential speed
r = radius of the circle described by the rotating object
Also:

Where:
f = frequency
Solving for f:

Since the frequency is calculated when the number of revolutions n and the time t are known:

We can solve for n:
n=f.t
The particle moves in a circle of r=90 m with a speed v=25 m/s. Thus the angular speed is:


Now we calculate f:


Calculating the number of revolutions:
n = 0.04421*30
n =1.33 revolutions
Answer: holding the ball in the air without moving it
Explanation:
When the ball goes up it’s potential energy
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