For an extended object, the weight force can be considered to act at which point?

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.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Which of the following best describes the circuit shown below?