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mASS=700g speed increased=4ms-1 to 6ms-1 find kinetic energy

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11th

Physics

Work, Energy and Power

Kinetic Energy

Calculate the change in the...

PHYSICS

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Asked on October 15, 2019 by

Ishu Paliwal

Calculate the change in the kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.

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VIDEO EXPLANATION

ANSWER

Given: Initial velocity =v; Final velocity =

3

v

Initial kinetic energy k

1

=

2

1

×m×v

2

Final kinetic energy k

2

=

2

1

×m×(

3

v

)

2

=

9

1

×

2

1

mv

2

Change in kinetic energy =

2

1

mv

2

−

9

1

×

2

1

mv

2

=

2

1

mv

2

(1−

9

1

)

=

9

8

×

2

1

×mv

2

=

9

8

× Initial kinetic energy.