Mark pushes his broken car 140 m down the block to his friend's house. he has to exert a 140 n horizontal force to push the car at a constant speed. you may want to review (page 299) . part a how much thermal energy is created in the tires and road during this short trip?

The work energy Mark spent to move the car is

(force) x (distance)

= (140 Newtons) x (140 meters) = 19,600 Joules .

The car moves with constant speed. That tells us that its

acceleration is zero, so the NET force on the car is also zero.

The friction force must be equal to Mark's pushing force, in

the opposite direction, and friction does as much work on the

car as Mark does . . . 19,600 Joules. The work done by the

friction force shows up as heat.

search it up!

explanation:

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer