During a car crash test, a car of mass 1200 kg is sent down a horizontal track at a constant velocity of 30 m/s. The car strikes a barrier that compresses until the car comes to a stop. This is very similar to a compressed spring. If the car comes to a stop in 0.25 seconds and the spring compresses 1.75 m, what power was needed to stop the car AND what was the spring constant of the barrier? A k = 352,700 N/m; P = 540,000 W
B k = 617,100 N/m; P = 2,160,000 W
C k = 617,100 N/m; P = 540,000 W
D k = 352,700 N/m; P = 2,160,000 W

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in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

small = small current large mag large current