The kinetic energy of an object of mass m, which moving with a velocity of 5 ms-1, is 25 J. What will be its kinetic energy when its velocity is doubled?
The kinetic energy of an object of mass m, which moving with a velocity of 5 ms-1, is 25 J. What will be its kinetic energy when its velocity is doubled? Correct Answer 100 J
The correct answer is 100 J.
Let the mass be m
⇒ v = 5m/s
⇒ K.E = 25 J
⇒ K.E = 1/2 mv2 = 25 J
⇒ K.E = 1/2 m (5)^2
= 25 x 2 = 25m = 2 kg
Now if the velocity becomes 2 times then the velocity is 2 x 5 = 10 m/s
Now new K.E = 1/2 x 2 x 102 = 100 J
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Feb 20, 2025