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# A motorcyclist slows down as he approaches a red light. He takes 3.2 seconds to come to stop, and travels 40m. a.) calculate how fast he was travelling initially b.) calculate his acceleration. Please show all working out, thanks a ton :D?

Hi Lola, You will need to apply 2 basic mechanics equations of motion. The best way to do this is by writing down what you are given and what you need to work out. For part a you can use x=0.5(intial v+final v)*t that gives you an intial v of 18.75 m/s. To work the acceleration( in this its going to be negative) you can use vfinal= vintial + a*t that is -5.86 m/s^2 . Hope this helps

Mohammed Rweished
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3.8k students helped

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