Phisic mechanic
posted by cls on .
A trailer mechanic pushes a 2500 kg car, home to a speed v, performing a job during the 5000 J. In this process, the car moves 25 m. Neglecting friction between the car and roadway:
(A) What is the final velocity v of the car?
(B) What horizontal force exerted on the car?

A) 1/2mv^2  1/2 mv^2= work
The first is the final KE
The second is the initial KE which = 0 since it was at rest 
A trailer mechanic pushes a 2500 kg car, home to a speed v, performing a job during the 5000 J. In this process, the car moves 25 m. Neglecting friction between the car and roadway:
(A) What is the final velocity v of the car?
(B) What horizontal force exerted on the car?