Match the description with the pitch produced.
thin string
high pitch
low pitch
thick string
high tension
short string
long string
low tension

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

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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answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6