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A speed problem


Jay Sharma
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hello i need help in solving this
Q)If the speed of a vehicle increases by 2 m/s,its kinetic energy is doubled,then original speed of the vehicle is
a)(sqrt of 2 )+1 m/s

b)2(sqrt of 2 -1)m/s

c)2(sqrt of 2 + 1 )m/s

d)sqrt of 2 (sqrt of 2 + 1)m/s

sqrt is square root of

please help me out

Thnx in advance

Edited by Jay Sharma
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so i got v=2 so how do i find the correct option sad.png

 

 

It's not the right answer.

 

I entered it to OpenOffice

A column is velocity

B column is K.E. with v

C column is. K.E. with v+2

D column is C/2

 

 

See where they're crossing..

 

post-100882-0-19379000-1391799829_thumb.png

 

You should not guess, but calculate..

 

v^2-4*v-4=0

 

Edited by Sensei
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It's not the right answer.

 

I entered it to OpenOffice

A column is velocity

B column is K.E. with v

C column is. K.E. with v+2

D column is C/2

attachicon.gifKinetic Energy table.png

 

See where they're crossing..

 

You should not guess, but calculate..

 

v^2-4*v-4=0

 

oh sorry i had taven -4 as +4 sorry for that

thank you sensai for your help

i found that the option c (c)2(sqrt of 2 + 1 )m/s)is correct please just crosscheck it once please

thank you please help me in my others questions in my other posts please

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