Basic Scientific Literacy Quiz Answer
Question Three
- Question:
True or False. It takes a car, traveling at 70 MPH, almost twice the
distance to stop as a car, traveling at about 50 MPH.
- Answer:
TRUE
The energy of a moving object is proportional to the square of its speed.
A car's brakes reduce the energy of a car a a constant rate so:
( (70)^2 / (50)^2 = 4900 / 2500 = 49 / 25 or about 2).