posted by Steph on .
A truck on a straight road starts from rest accelerating at 2.0 m/s2 until it reaches a speed of 20 m/s. Then the truck travels for 20 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.0 s. What is the average velocity of the truck for the motion described?
Add up the distances travelled during the acceleration, constant-velocity, and deceleration phases of the journey. Then divide that total distance travelled by the elapsed time (10 + 20 + 5 s) to get the average velocity. If you need additional help, show your worka and it will be provided.
If instead, the swimmer makes 25.5 laps in the same pool in 1.5 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed.