Atoy truck has a speed of 4 m/s and kinetic energy of 48 j. what is its mass?
a. 8 kg
b. 4 kg
c. 6 kg
d. 10 kg

48/4= 12

12/2= 6

C. 6 kg

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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