A 1,200 kg car initially traveling at 20 meters/second increases its speed to 28 meters/second. How much work did the car's engine have to do to cause this change?

Asimply means that over time there was some sort of change.

Asample of a gaseous substance changes into a liquid

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33