A train is traveling in one direction along a straight track. The train is acted on by a known and constant net force for a known time interval. What other information does the student have to know to determine the train’s final velocity? A
mass of train and incline of track

B
incline of track and friction of train with track

C
mass of train and initial velocity

D
friction of train with track and initial velocity

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: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.