Newton’s Thrid Law, which states that for every reaction there is an opposite reaction.
The answer is: [C]: "elasticity" .
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That's the definition of the PERIOD of the vibration.
It's exactly the reciprocal of the vibration's frequency.
Answer:

Explanation:
Distance is the product of speed and time.

The speed of the car is 75 kilometers per hour. It traveled for 5.5 hours.

Substitute the values into the formula.

Multiply. Note that the hours will cancel each other out.

The car travelled <u>412.5 kilometers.</u>
Answer:
v = 2.94 m/s
Explanation:
When the spring is compressed, its potential energy is equal to (1/2)kx^2, where k is the spring constant and x is the distance compressed. At this point there is no kinetic energy due to there being no movement, meaning the net energy in the system is (1/2)kx^2.
Once the spring leaves the system, it will be moving at a constant velocity v, if friction is ignored. At this time, its kinetic energy will be (1/2)mv^2. It won't have any spring potential energy, making the net energy (1/2)mv^2.
Because of the conservation of energy, these two values can be set equal to each other, since energy will not be gained or lost while the spring is decompressing. That means
(1/2)kx^2 = (1/2)mv^2
kx^2 = mv^2
v^2 = (kx^2)/m
v = sqrt((kx^2)/m)
v = x * sqrt(k/m)
v = 0.122 * sqrt(125/0.215) <--- units converted to m and kg
v = 2.94 m/s