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CBSE Class 10 Answered

How much work must be done to stop a body of 1000kg travellihg at 100km/h?
Asked by | 28 Apr, 2009, 03:01: PM
answered-by-expert Expert Answer

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.

Use

Work done  = change in kinetic energy

 

Answered by | 05 May, 2009, 10:50: AM

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