In an effort to determine which driver was at fault, you have noted the followin

Question

In an effort to determine which driver was at fault, you have noted the following facts 70-foot-long skid marks (21.3 m) exist going off at a 70-degree angle from the collision point, as shown in figure 1. The skids indicate that the two vehicles were locked together from the moment of impact until coming to rest a. b. It is a dry, sunny day and the road is composed of asphalt. Based on this information, your fellow officer has already calculated that the force of friction between the road surface and the tires can provide a maximal acceleration or deceleration of 6.4 m/s2 The car on the minor road (Porsche) has a stop sign at the intersection and the major road has a speed limit of 45 mph 20.1 m/s. The cars were presumably travelling straight just before the collision. The collision occurred towards the left-hand side of the major road roughly one quarter of the way across, as shown in figure 1. c. d. The two cars have essentially the same mass. According to the manufacturer's specifications, a Porsche Carrera can accelerate from 0 to 60 mph in 5.3 seconds. This is an acceleration of 5.1 m/s e.

Explanation / Answer

4) using v*v=u*u +2aS

We got combined velocity=sqrt(2aS)=16.5 m/s

5)conserving momentum

m*v=2m*16.5*cos(70)

v=11.3 m/s

6)let the distance be S

11.3*11.3=2*5.1*S

We got S=12.5 m

(7)

No ,Porsche driver did not stop but was speeding down as velocity was only 11.3 m/s

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