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?


1
Expert's answer
2022-06-01T12:48:54-0400

(a)

t=Δva=12  m/s3m/s2=4st=\frac{\Delta v}{a}=\frac{-12\;\rm m/s}{-3\:\rm m/s^2}=4\:\rm s

(b)

d=v0t+at2/2=124+(3)42/2=24md=v_0t+at^2/2\\ =12*4+(-3)*4^2/2=24\:\rm m


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