50pts Each
In order to differentiate between speed, displacement, and acceleration, a physical science student models the three terms using a toy car. The car is rolled forward 20 meters, turns around, and is rolled back to the starting point (another 20 meters) in 10 seconds.
A) The acceleration occurred when the car changed direction.
B) The speed was forty meters in 10 seconds, or 4 meters per second.
C) The speed was zero, since the object had no overall displacement.
D) The velocity was forty meters in 10 seconds, or 4 meters per second.
E) The velocity was zero, since the object returned to its original location with zero displacement.