Question
A car starts from rest and accelerates to a speed of 60 mph in 12 sec. It travels 60 mph for 1 min and then decelerates for
20 sec until it comes to rest. The speed of the car s(t) (in mph) at a time t (in sec) after the car begins motion can be
modeled by:
for 0 <t< 12
12
s(1) =
60
for 12 < ts 72
2(92 – 1? for 72 < t< 92
3
20
Determine the speed of the car 6 sec, 12 sec, 45 sec, and 80 sec after the car begins motion.
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Algebra
Transcribed Image Text

A car starts from rest and accelerates to a speed of 60 mph in 12 sec. It travels 60 mph for 1 min and then decelerates for 20 sec until it comes to rest. The speed of the car s(t) (in mph) at a time t (in sec) after the car begins motion can be modeled by: for 0 <t< 12 12 s(1) = 60 for 12 < ts 72 2(92 – 1? for 72 < t< 92 3 20 Determine the speed of the car 6 sec, 12 sec, 45 sec, and 80 sec after the car begins motion.