Question

What work is said to be done to increase the velocity of a car from 15 km/h to 30 km/h, if the
mass of the car is 1000 kg?

Answer 1

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ANSWER

Given:-

u=15km/h

v=30km/h

Mass=1000 kg

W=?

W=K.E.=

2

1

m(v

2

−u

2

)

=

2

1

×1000×((30)

2

−(15)

2

)

=

2

1

×1000(900−225)

=

2

1

×1000(675)

K.E.=337500J

∴ Work done =337500 Joule.

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Answer 2

Answer:

Given:-

u=15km/h

v=30km/h

Mass=1000 kg

W=?

W=K.E.= 1/2m(v^2−u^2.)

=1/2×1000×((30)^2−(15)^2)

=1/2×1000(900−225)

1/2*1000(675)

K.E.=337500J

∴ Work done =337500 Joule.

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