Why is more impulse delivered during a collision when bouncing occurs than during when it doesn't

What is the answer for this. the correct answer only

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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.