Question

the kinetic energy of an object of mass moving with a velocity of 5m/s is 25 J.What is its kinetic energy when it's velocity is increased 3 times
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Answer 1

Answer:

Let the mass be m

v = 5m/s

K.E = 25 J

K.E = 1/2 mv^2

25 = 1/2 m (5)^2

25 x 2 = 25m

m = 2 kg

Now if the velocity becomes 3 times then the velocity is 3 x 5 = 15m/S

Now new K.E = 1/2 x 2 x 15^2

= 225 J

Answer 2

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