I need help. The question came up in my mind from nowhere. I took u=5 m/s , v=-5m/s and s=10 m. Using the third equation ,I tried to calculate the acceleration which lead to a disaster.

v^2=u^2+2as

-5^2=5^2+2a10

25=25+20a

0=20a

0=a

This is a very surprising result as v is not equal to u. But according to the result, there is no acceleration.

SOS.

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## Comments

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TopNewestThe problem is that s cannot equal 10. If you start at 5m/s and end at -5m/s with a constant acceleration then you are going to go forward a certain distance but then go backwards exactly the same distance so s=0

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A good answer but then what about the acceleration . Will it also be zero?

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No, from the u and v values you know a has to be non zero and negative but you cannot know anymore about it from this equation. To find a you would need to use one of the other equations of motion and need some extra information like t.

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