How much work must be done to stop a body of 1000kg travellihg at 100km/h?
Asked by | 28th Apr, 2009, 03:01: PM
Find the kinetic energy of the body moving at this speed. The work that must be done is equal to the change in kinetic energy of the body.
K = 1/2mv^2. Put m =100kg.
Change in speed given in km/h to m/s by multiplying by 5/18 ( obtained by simplifying 1000/3600).
The final velocity of the body is zero as it has to be stopped, so final kinetic energy = 0.
Work done = change in kinetic energy
Answered by | 5th May, 2009, 10:50: AM
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