Wednesday

January 28, 2015

January 28, 2015

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.

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