A 1100 kg car which was moving at 12.0 m/s, was hit by a 1400kg van that was com

Question

A 1100 kg car which was moving at 12.0 m/s, was hit by a 1400kg van that was coming behind it. After collision bothvehicles stick together and move forward. If their speed justafter the collicion was 16.5 m/s what was the speed of the van justbefore the collision (assume the road is frictionless). ____ m/s A 1100 kg car which was moving at 12.0 m/s, was hit by a 1400kg van that was coming behind it. After collision bothvehicles stick together and move forward. If their speed justafter the collicion was 16.5 m/s what was the speed of the van justbefore the collision (assume the road is frictionless). ____ m/s

Explanation / Answer

Mass of car m = 1100 kg

Mass of van M = 1400 kg

Initial speed of car u = 12 m / s

Initial speed of van U =?

Speed of the both vehicles after collision v = 16.5 m / s

From law of conservation of momentum , mu + MU = ( m+ M) v

13200 + 1400 U = 41250

Speed of the van just before collision U = 20 m / s                   

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