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Work and Energy
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Given: Initial velocity,
Final velocity, (because car will stop)
Mass of the body,
We know, kinetic energy of a body is
The initial kinetic energy of the body,
The final kinetic energy of the body,
Work done = Change in kinetic energy
Work done = Final K.E. - Initial K.E.
Work done = 0 J - 208333.3 J
Work done = -208333.3 J
Here, the negative sign shows that the force is acting in the opposite direction of the motion of the object.
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