A 1550kg car, traveling with a velocity of 12m/s plows into a 1220kg stationary car. During the collision the two cars lock bumpers and then move together as a unit. (a) what is tehir common velocity just after the impact?(adsbygoogle = window.adsbygoogle || []).push({});

(b) What fraction of the initial kinetic energy remains after the collision.

(a) Pf=Pi

(m1+m2)vf=m1vi1

(1550kg+1220kg)vf=1550kg(12m/s)

2770kgvf=18600kg m/s

vf=6.71 m/s

I know my answer for part A is correct but part B i really have no idea how to approach it.

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# Homework Help: Impulse and Momentum

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