a) A car stopped at an intersection has a mass 850 kg. It is rear-ended by a 300 kg truck traveling with a speed of 12.5 m/s. Assuming the collision is elastic, find the speed of each vehicle after the collision.  b) For an elastic collision, is kinetic energy conserved?

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter8: Momentum And Collisions
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a) A car stopped at an intersection has a mass 850 kg. It is rear-ended by a 300 kg truck traveling with a speed of 12.5 m/s. Assuming the collision is elastic, find the speed of each vehicle after the collision. 
b) For an elastic collision, is kinetic energy conserved?

Expert Solution
Part a:

Given ,m1=850 kgm2 = 300 kgu1=0u2 =12.5 m/s

Step 2

From conservation of momentum,m1u1+m2u2=m1v1+m2v2850(0)+300(12.5) = 850V1+300V2850V1+300V2=3750   -----Equation (1)

 

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