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Q.

A moving body of mass 0.5kg has 40J of kinetic energy. Calculate the speed of the body.


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a

210 m/sec

b

410 m/sec

c

510 m/sec

d

310 m/sec 

answer is B.

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Detailed Solution

A body's translational kinetic energy is equal to one-half the product of its mass, m, and its velocity, v, or 12mv2
Here, m= 0.5kg, K.E.= 40J
So, v = 2 X K.E.m = 2 X 400.5 = 410  m/sec
 
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