Question

Certain force aching on a 40 lg mass changes its velocity from 4 m/s to 2 m/s. Calculate the work done by the force,​

Answer 1

Answer:

Explanation:

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Class 11

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>>Certain force acting on a 20 kg mass cha

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Certain force acting on a 20 kg mass changes its velocity from 5 ms

−1

to 2 ms

−1

. Calculate the work done by the force.

Medium

Solution

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Given : Initial velocity u=5 m/s

Final velocity v=2 m/s

The work done is equal to the change in the kinetic energy of an object.

W=

2

1

​

m(v

2

−u

2

)

W=

2

1

​

×20×(2

2

−5

2

)

⟹W=−210 J

Answer 2

Answer:

-210 joules is the answer of your question