Asked by Miranda

A railroad car with a mass of 1.91 multiplied by 104 kg moving at 2.86 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.40 m/s.

What is the speed of the three joined cars after the collision?

What is the decrease in kinetic energy during the collision?

Answers

Answered by bobpursley
conservation of momentum applies

Momentum before= momentum after
M*2.86+2M*1.40=3M*V
find V

Answered by Miranda
How do you find the "decrease in kinetic energy during the collision?"
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