Answer to Question #347276 in Physics for maria

Question #347276

A motor cyclist travelling at 12m/s decelerates at 3m/s².

a) How long does it take?

b) how far does he travel in coming to rest?

Expert's answer

(a)

"t=\\frac{\\Delta v}{a}=\\frac{-12\\;\\rm m\/s}{-3\\:\\rm m\/s^2}=4\\:\\rm s"

(b)

"d=v_0t+at^2\/2\\\\\n=12*4+(-3)*4^2\/2=24\\:\\rm m"

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