Question

A car of mass 500 kg is moving at a speed of 1.2m/s. A man pushes the car increasing the speed to 2 m/s. How much work did the man do

Answer 1

Work:

A = 640 J

Step-by-step explanation:

Given:

m = 500 kg

V₁ = 1.2 m/s

V₂ = 2.0 m/s

____________

A - ?

The work is equal to the change in the kinetic energy of the car:

A = Δ Wk

A = m·V₂² / 2 - m·V₁² / 2

A = (m/2)·(V₂² - V₁²)

A = (500/2)·(2² - 1.2²) = 640 J