The kinetic energy of an object of mass m, moving with a velocity of 5ms−1 is 25 J. What will be its kinetic energy when its velocity is tripled?
125J
500J
225J
100J
A
125J
B
225J
C
100J
D
500J
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Solution
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Given, velocityofobject,v=5ms−1; kineticenergyofanobject,EK=25J EK=12mv2 or 25=12×m×(5)2 or m=5025=2kg When the velocity triples, EK=12mv2=12×2×(15)2=225J
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