Using the train diagram below, what will be the resulting velocity of the coupled cars after the collision?

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.

What is the speed of an object at a given moment?

In a good thermo flask the main cause of heat loss is