Because it generates enough momentum to keep the train going with out really having to speed up
Answer:
a) 4.49Hz
b) 0.536kg
c) 2.57s
Explanation:
This problem can be solved by using the equation for he position and velocity of an object in a mass-string system:

for some time t you have:
x=0.134m
v=-12.1m/s
a=-107m/s^2
If you divide the first equation and the third equation, you can calculate w:

with this value you can compute the frequency:
a)

b)
the mass of the block is given by the formula:

c) to find the amplitude of the motion you need to know the time t. This can computed by dividing the equation for v with the equation for x and taking the arctan:

Finally, the amplitude is:

Energy resources that cannot be replaced are called "non-renewable" energy resources.
Answer:
protected under students first amendment rights
Explanation:
did the studyisland :)
<span>
The taut guitar string haspotencial energy which we can see in action.</span> <span>· so option a is correct.</span>