<p>:P</p>
<p>1) A truck on a straight road starts from rest accelerating at 2.0 m/s^2 until it reaches a speed of 20 m/s. Then the truck travels for 20 s at a 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?</p>
<p>2) A cesna aircraft has a lift-off speed of 120 km/h. (A) What minimum constant acceleration does this require if the aircraft is to be airborne after a takeoff run of 240 m? (B) How long does it take the aircraft to become airborne?</p>
<p>3) An electron moving in a straight line has an intial speed of 3.0x10^5 m/s. It undergoes an acceleration of 8.0x10^14 m/s^2. (A) How long will it take to reach a speed of 5.4x10^5 m/s? (B) How far will it have traveled in this time?</p>
<p>thanks in advance!!</p>