Question

What is the work to be done to increase the velocity of a car from 30km/hr to 60km/hr if the mass of a car is 1000kg?​

Answer 1

Answer:

Initial velocity    u=30 km/h=30×185=325 m/s

Final velocity    v=60 km/h=60×185=350 m/s

Mass   m=1500 kg

Work done   W=21mv2−21mu2

⟹ W=2m(v2−u2)=21500×((350)2−(325)2)=156187 J

Answer 2

Step-by-step explanation:

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.