Question

A body is moving with an acceleration of 60m/s. If the 205 force applied to the body is 42000 N, calculate its mass​

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11th

Physics

Work, Energy and Power

Introduction to Work

A force is applied on a bod...

PHYSICS

A force is applied on a body of mass 20kg moving with a velocity of 40ms

−1

. The body attains a velocity of 50ms

−1

in 2 seconds. Calculate the work done to attain this velocity.

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VIDEO EXPLANATION

ANSWER

Force =m

t

(v−u)

=m⋅a

Displacement =

2a

(v

2

−u

2

)

Word done (W) = Force × Displacement

=m⋅a⋅

2a

(v

2

−u

2

)

W =

2

1

m(v

2

−u

2

)

W =

2

1

×20×(2500−1600)

=

2

1

×20×900

=9000J

Therefore, the work done to attain the final velocity is 9000J