Question

4). if velocity of a body increases 3 times, then what is the increase in k.e?

Answer 1

K.E = 1/2×m×v sq

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Answer 2

We know,

Kinetic energy = 1/2 x m x v^2

If v increases 3 times, v = 3v

So new kinetic energy = 1/2 x m x (3v)^2

= 9 ( 1/2 x m x v^w)

= 9 x (original kinetic energy)

So kinetic energy increases 9 times.

Hope you have understood.