Question

A 5000-kg car accelerated from rest to 20 m/s. Determine the net work done on the car.

Answer 1

Answer:

1000,000 Joule

Explanation:

According to Newton's second law, a net force applied to the object causes acceleration of the object. The work-energy principle states that the work done by the net external force causes change in kinetic energy of the object.

Answer and Explanation:

Given Data

mass of Car,  

m = 5000 k g

initial speed of car,  

u = 0 m / s

final speed of car,  

v =20 m /s

Wnet = ΔEK

Wnet = ½ m (vt2 – vo2)

Wnet = net work

ΔEK = the change in kinetic energy

m = mass (kg),

vt = final speed (m/s),

vo = initial speed (m/s).

Net work :  

Wnet = ½ m (vt2 – vo)

         = ½ (5000)(202 – 02)

          = (2500)(400 – 0)

         = (2500)(400)

         = 1000,000 Joule

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