Saturday

December 20, 2014

December 20, 2014

Posted by **dmkp** on Wednesday, March 28, 2012 at 12:51pm.

a) is this an elastic or inelastic collision

b) calculate the velocity of the two cars immediatly after the collision

c) If the brakes of the stationary cars are applied before impact and the coefficient of friction between the wheels and the road surface is 0.4 calculate the decelaration of the cars.the time taken for the cars to come to rest and the distance travelled by the cars

- kinetics -
**Elena**, Wednesday, March 28, 2012 at 3:27pma) This is the inelastic collision.

b)

v =40 km/h=11.11 m/s

M(st)•0+M(mov) •v=(M(st)+M(mov)) •V

V= M(mov) •v/(M(st)+M(mov))=1300•11.11/(1300+1500) =5.158 m/s.

c) m•a =F(fr) = k•m•g

a=k•g =0.4•9.8 =3.92 m/s.

s=v^2/2a = (11.11)^2/2•3.92 = 15.72 m

0 = v- at

t = v/a – 11.11/3.92 = 2.83 s.

**Answer this Question**

**Related Questions**

kinetics - a stationary car is hit from behind by another car travelling at 40km...

kinetics - a stationary car is hit from behind by another car travelling at 40km...

kinetics - a stationary car is hit from behind by another car travelling at 40km...

physics - the most common reasons for rear - end collisions are too short a ...

Khudu secondary - Car A of mass 1 000 kg,stationary at a traffic light,is hit ...

Physics - You are the juror of a case involving a drunken driver whose 972 kg ...

physics - An automobile has a mass of 2150 kg and a velocity of +18 m/s. It ...

Physics - The engine is in the back of the train it is pushing. The passengers ...

general physics - An automobile has a mass of 1520 kg and a velocity of 19.7 m/s...

general physics - An automobile has a mass of 1520 kg and a velocity of 19.7 m/s...