Question

At what speed a body of mass 1 kg will have a kinectic energy 1 J. If the speed of a body is half what is the change in its kinectic energy.

Answer 1

Explanation:

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K. E = 1/2 mv^2

1 = 1/2 (1)(v^2)

v^2 = 2

v = √2

So velocity is √2

If velocity is 1/2× √2

then..

K. E = 1/2 mv^2

= 1/2 (1) (√2/2)

= √2/4

K. E = √2/4

Answer 2

Answer:

K. E = 1/2 mv^2

1 = 1/2 (1)(v^2)

v^2 = 2

v = √2

So velocity is √2

If velocity is 1/2× √2

then..

K. E = 1/2 mv^2

= 1/2 (1) (√2/2)

= √2/4

K. E = √2/4

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