Help for 15 points

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.

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?