Over a span of 6.0 seconds, a car changes its speed from 89 km/h to 37 km/h. what is its average acceleration in meters per second squared (m/s2)

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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a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up