It was once recorded that a Jaguar left skid marks that were 290m in length. Assuming that the…

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Question

It was once recorded that a Jaguar left skid marks that were 290m in length. Assuming that the Jaguar skidded to a stop with a constant acceleration on -3.9m/s, determine the speed of the jaguar before it began to skid.
I have done this twice and I always get 0 for an answer...I figured that the final velocity is 0, the distance 290 and the acceleration -3.9...is this incorrect? I use the vf{squared}=vi{squared}+2ad equation...am i using the wrong one...or am i just calculating it incorrectly? Please help...I really don't like physics right now... =(

 

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