Question

Kinetic energy of a body moving with speed of 10ms is 30J if it's speed becomes 30ms it kinetic energy will be ?

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Answer 1

Answer:

270 j

Explanation:

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Answer 2

Answer:

270 J

Explanation:

WE KNOW,

K.E=1/2 Mv²

IT MEANS,

             K.E∝ v²

In first half of statement, K.E is 30 J when speed of body is 10 ms-1.

It means v²=100 and K.E is 30 J.

In 2nd half speed is increased to 30 ms-1.

So,

      v²=900

which is 9 times of the original value so K.E will also increase 9 times of original value and new value of K.E will be

           K.E= 270J