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A car starts from rest heading due east. It first accelerates at 3.0m/s^2 for 5.0s and then continues without further acceleration for 20.0s. It then brakes for 8.0s in coming to rest. (a) What is the car's velocity after the first 5.0 seconds? (b) What is the car's acceleration over the last 8.0s interval? (c) What is the total displacement?
This is what i got: a) vf=vi+at
=0(3)(5)
vf=15m/s
b) vf=vi+at
0=15+a(8)
-15=a(8)
a=-1.7m/s^2
c) d1=37.5m
d2=300m
d3=65.6m
dtot=403.1m
The Attempt at a Solution
This is what i got: a) vf=vi+at
=0(3)(5)
vf=15m/s
b) vf=vi+at
0=15+a(8)
-15=a(8)
a=-1.7m/s^2
c) d1=37.5m
d2=300m
d3=65.6m
dtot=403.1m