Question

Energy required to accelerate a car from 10 ms-1 to 20 ms? compared with that required to accelerate it from 0 to 10 ms is
a) twice by
three times
c) four times
d) same​

Answer 1

Answer:

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Class 11

>>Physics

>>Motion in a Straight Line

>>Acceleration

>>Energy required to accelerate a car from

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Energy required to accelerate a car from 10 to 20 m/s compared with that required to accelerate from 0 to 10 m/s is

Medium

Solution

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Correct option is C)

Energy required E=

2

1

mv

2

−

2

1

mu

2

=

2

1

m(v

2

−u

2

)

where m is the mass of the car.

Case 1 :

Initial speed u=10 m/s

Final speed v=20 m/s

Energy required E

1

=

2

1

m(20

2

−10

2

)=150m Joules

Case 2 :

Initial speed u=0 m/s

Final speed v=10 m/s

Energy required E

2

=

2

1

m(10

2

−0)=50m Joules

⟹ E

1

=3E

2