A car waits at a ref light for a few seconds, and then accelerates straight ahead to 54km/h in 3.1s and then cruises at a constant speed for 75m. Find the total distance and time travelled

1a)

x1=vt

x1=25*0.85=21.25 m

1b)

a=v/t

a=25/3.5=2.2 m/s^2

x=v^2 / (2a) + x1

x=625/4.4+21.25=163.3 m

c)

a=v/t

a=25/3.5=2.2 m/s^2

2)

a=v/t=15/3.1=4.8 m/s^2

x1=v^2 / (2a)

x1=225/9.6=23.4 m (while accelerating)

x2=vt=15*4500=67,500 m

total distance is

x=x1+x2=23.4+67,500=67,523.4 m = 67.523 km