Final answer:
The speed that must be reached before the dynamic brake becomes effective is at least 26 MPH.
Step-by-step explanation:
The speed that must be reached before the dynamic brake becomes effective is at least 26 MPH.
Dynamic brake is a system used in trains and some electric vehicles to slow down the vehicle by converting kinetic energy into electrical energy. The dynamic brake only becomes effective when the vehicle is moving at a certain speed.
For example: If you drive a car at exactly 50 mph, and then apply the brakes until it stops, you can record the distance it takes to stop. This recorded distance can help determine the minimum speed at which the dynamic brake becomes effective. If the distance it takes to stop is less than the distance required for the dynamic brake to become effective (26 MPH), then the dynamic brake will not be able to slow down the vehicle effectively at speeds below that.