college physics
posted by barbara .
a railway freightbcar whose mass is 15 000kg & speed is 2.4m/s runs into a stationary freight car whose mass is 25 000kg. the 2 cars couple & roll off the track. what is the speed if the 2 cars as tey move together down the track? and how much kinetic energy is lost in the collision?

college physics 
bobpursley
a. use conservation of momentum.
(m+M)V=m*2.4+M*0 solve for V.
Next,
lost KE= initial KEfinal KE=1/2 m*2.4^21/2 (m+M)V^2
Respond to this Question
Similar Questions

Science
Find the mass of a car that has the speed of 30m/s and a momentum of 45,000kg,m/s. 
Psychics
A freight car is moving freely along a railroad track at 7.0 m/s and collides with a tanker car that is at rest. After the collision, the two cars stick together and continue to move down the track. What is the magnitude of the final … 
Physics
In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1.1 m/s and collides with an initially stationary, fully loaded boxcar of mass 4.3m. The two cars couple together upon collision. (a) … 
Physics
a 10,000kg boxcar rolling west at 60mph collides with an empty tanker of mass 7000kg sitting at rest on the track. The cars attach and continue to roll west on the track. What is the speed of the connected cars? 
Physics
A 24ton freight car rolls along a straight track with a speed of 10mph. A 2.0 ton automobile falling vertically lands on the freight car from above. a) what is the speed of the freight car after the car lands on it? 
Science
a 2000kg car traveling at 8 m/s strikes a stationary car whose mass is the same. The two cars stick together after the crash. What is their speed just afterward? 
physics
An automobile has a mass of 2150 kg and a velocity of +18 m/s. It makes a rearend collision with a stationary car whose mass is 1850 kg. The cars lock bumpers and skid off together with the wheels locked. What is the velocity of the … 
Physics
An automobile has a mass of 2000 kg and a velocity of +12 m/s. It makes a rearend collision with a stationary car whose mass is 1850 kg. The cars lock bumpers and skid off together with the wheels locked. 
PHYSICS answer check
A group of 4 rail cars with a total mass of 50,000kg moves at 3m/s at a stationary locomotives that has a mass of 10,000kg. What is the speed of the whole train after the cars connect with the locomotive? 
Physics
A freight train has two engines, each with a mass of 50,000kg, pulling 15 freight cars, each having a mass of 40,000kg.The