A railroad car with a mass of 2.48 × 104 kg moving at 3.50 m/s collides and 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 1.19 m/s. a) What is the final speed of the three joined cars after the collision?
Answer in units of m/s
(Part two) b) What is the decrease in kinetic energy during the collision?
Answer in units of J
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Verified answer
m1u1+m2u2=v(m1+m2)
Or,m1u1+2m1u2=v(m1+2m1) [m2=2m1]
Or,u1+2u2=v 3 [Dividing by m1]
Or,3.5+2x1.19=3 v
Or,v=1.96 m/s
The velocity of three joint cars 1.96 m/s.