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20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

Atomic nuclei of almost all elements consist of