Answer:
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However, there is one type of double-replacement reaction that we can predict: the precipitation reaction. A precipitation reaction occurs when two ionic compounds are dissolved in water and form a new ionic compound that does not dissolve; this new compound falls out of solution as a solid precipitate.
<u>Answer:</u>
The height of the cliff in meters = 27.44
<u>Explanation:</u>
The potential energy of a body is given by the expression, PE = mgh, where m is the mass of the body, g is the acceleration due to gravity value and h is the height of the body.
Here we have mass of rock = 13 kg
Potential energy = 3500 J
Acceleration due to gravity = 
Substituting 3500 = 13 * 9.81 * h
h = 27.44 meter
The height of the cliff in meters = 27.44
Answer:
v₀ = 3.77 [m/s]
Explanation:
This problem can be solved in a simple way by means of the following equation of kinematics.

where:
y - yo = 0.441 [m]
Vo = initial velocity [m/s]
g = gravity acceleration = 9.81 [m/s²]
t = time = 0.625 [s]
![0.441 = v_{o}*(0.625)-\frac{1}{2} *9.81*(0.625)^{2} \\2.357 = v_{o}*0.625\\v_{o}=3.77[m/s]](https://tex.z-dn.net/?f=0.441%20%3D%20v_%7Bo%7D%2A%280.625%29-%5Cfrac%7B1%7D%7B2%7D%20%2A9.81%2A%280.625%29%5E%7B2%7D%20%5C%5C2.357%20%3D%20v_%7Bo%7D%2A0.625%5C%5Cv_%7Bo%7D%3D3.77%5Bm%2Fs%5D)
Note: The sign of the acceleration is negative since the movement of the basketball player is against of the gravity acceleration.