During a test by the editors of an auto magazine, the stopping distanc

Amari Flowers 2021-08-20 Answered
During a test by the editors of an auto magazine, the stopping distance s (in metres) of the MacPherson X-2 racing car conformed to the rule
s=f(t)=40t5t2(t0) where t was the time (in seconds) after the brakes were applied.
a. Find an expression for the cars
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ensojadasH
Answered 2021-08-21 Author has 100 answers
a)The velocity is the displacement over time so we divide s by t: v(t)=st
v(t)=40t5t2t
v(t)=40-5t
b)The brakes were first applied at t=0 so using v(t): v(0)=40-5(0)
v(0)=4040ms
c)Setting v=0, we have 0=40-5t
5t=40
t=88 seconds
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