If the person generates another pulse like the first but the rope is tightened, the pulse will move:. A. at the same rate
B. faster
C. slower

the correct answer is B

Explanation:

The speed of a pulse on a string is described by the expression

          v =√T/μ

where v is the speed of the pulse, t is the tension of the string and μ the linear density of the string

When applying this equation to our case, if the string is taut, it implies that the tension has increased so that the pulse speed is FASTER

the correct answer is B

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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