Is rate of change of position.
a. speed
b. velocity
c. acceleration
d. displacement

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

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.

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