Question

A man is driving his 1100 kilogram car at 36 km per hour on a straight highway. After accelerating for 30 second the car has a speed of 108 km per hour. how much work did the engine do during 30 seconds?​

Answer 1

Mass of the car m=1000 kg

Initial velocity of car v

1

=0

Final velocity of car v

2

=100km/h=100×

18

5

m/s=27.78m/s

Average power of car=change in kinetic energy per unit time=

t

2

1

mv

2

2

−

2

1

mv

1

2

,since v

1

=0

So,average power of car=

t

2

1

mv

2

2

=

5

2

1

×1000×27.78

2

=7.71×10

4

W

Answered By=shreyash. ......

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