Question

The kinetic energy of an object of mass, m moving with a velocity of 5 m/s is 25J. What will be its kinetic energy when it's velocity is doubled? What will be its kinetic energy when it's velocity is increased three times?

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Answer 1

Answer:

100 J and 225 J

Explanation:

First we have to find mass of the object,

So,

25J = 1/2m * 5^2

25J = 25m/2

50 = 25m

m = 2kg

Now we know that mass is 2kg

When velocity is doubled,

K.E. = 1/2 * 2 * (2*5)^2

K.E. = 100J

When Velocity is tripled,

K.E. = 1/2 * 2 * (3*5)^2

K.E. = 225J