A truck of mass 7,000 kg is traveling along a level road at an initial speed of
ID: 1310769 • Letter: A
Question
A truck of mass 7,000 kg is traveling along a level road at an initial speed of 20 m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 11 m/s.
(a) Find the total work done on the truck. (in J)
(b) What force(s) do this work on the truck? (There may be more than one. Select all that apply.)
air drag
friction from the road
gravity
the normal force from the road
(c) The final kinetic energy of the truck is less than its initial kinetic energy. Where does this energy go? (Select all that apply.)
heat within the vehicle
heat within the road
heat within the air gravitational
potential energy
Explanation / Answer
a) W = Kf- Ki = 1/2*m*(Vf^2 - Vi^2 ) = 976.5 J
b) air drag and Friction from raod
c)
heat within the road
heat within the air gravitational
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.