a car traveling westward at 20 m/s turns around and travels eastward at 5 m/s. what is the change in velocity of the car?
To find the change in velocity of the car, we need to subtract the final velocity from the initial velocity.
The initial velocity of the car is 20 m/s when traveling westward, which we can denote as -20 m/s (since traveling westward is considered negative velocity).
The final velocity of the car is 5 m/s when traveling eastward, which we denote as +5 m/s (since traveling eastward is considered positive velocity).
To find the change in velocity, we subtract the final velocity from the initial velocity:
Change in velocity = Final velocity - Initial velocity
= (+5 m/s) - (-20 m/s)
= 5 m/s + 20 m/s
= 25 m/s
Therefore, the change in velocity of the car is 25 m/s.