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What is the velocity of a 9000 kg railroad car and a 5000 kg railroad car when the first car was traveling at 3 m per s?
Wiki User
∙ 12y ago
Momentum is mass multiplied by velocity. The formula for momentum is: p (momentum)= m (kg ) x v (meters/second). So in this case, the mass is 9000 kg and the velocity is 3 m/s, so its momentum is 27000 kg-m/s, or N-s.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoconservation of momentum law:
m1*v1=m2*v2
m1=mass before collision(9000kg)
v1=velocity before collision(3m/s)
m2=mass after collision(9000kg+5000kg=14000kg)
v2=velocity after collision(unknown)
substituting numbers gives
9000*3 = 14000*v2
transposing equation to isolate v2 gives
(9000*3)/14000 = v2
1.9286(m/s) = v2
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