The energy required to accelerate a car from 10 m/s to 20 m/s is how many times the energy required to accelerate the car from rest to 10 m/s.

Options :
  1. 2 times
  2. 3 times
  3. equal
  4. 1/2 times
Answer and Explanation :-

Answer: Option 2


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By: haripriya On: Nov/26/2016

Let us consider two bodies A and B where the displacement of A and B are same
V=20m/s v=10m/s
U=10m/s u=0m/s
S=s S=s
We know, We know
V2 - u2=2as V2 - u2=2as
202 - 102=2as 100=2as
400-100=2as as=50
300=2as a=50/s
Taking ratio A:B 150/s:50/s So Ans is 3times

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