# Cars Slam on brakes

**1. The problem statement, all variables and given/known data**

Car 1 travels 50km/hr

Car 2 travels 100km/hr

The Cars are 45m apart

Car 1 slams on brakes and stops in 8m

a) Calculate deceleration of Car 1? (Car 1 has the same deceleration as Car 2)

b) Use deceleration to find the distance it took Car2 to stop?

c) Did the cars hit?

**The attempt at a solution**

Car 1 = 50 km/hr = 13.89 m/s

Car 2 = 100 km/hr = 27.78 m/s

a) Vf^2-Vi^2 = 2a(Delta x)

0 – 13.89^2 = 2a(8)

-192.932=16a

a= -12.05 m/s^2

b) 0-27.78^2=2(-12.05)x

-771.7=-24.1x

Distance it took Car2 to stop is = 32 m

c) 45-32= 13m apart

**IS THIS RIGHT?**

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