Posted by eric on Tuesday, March 23, 2010 at 12:33am.
Use conservation of momentum. When the cars are coupled, they have the same velocity
13,300lb*7.4 ft/s = (13,300+6790)lb*Vfinal
It is not necessary to convert the weight unit to mass in this case. g would appear on both sides and cancel out.
Vfinal = 7.4 ft/s*(0.662) = 4.9 ft/s
The impulse received by the first car equals its loss of momentum:
(13,300/32.2)slug *(4.9 - 7.6)ft/s
= -1115 slug ft/s (or lbf-seconds)
Mass units of slugs are needed when calculating momentum.
Related Questions
Trigonometry - How much work is done by raising a 117-lb box vertically 18.0 ...
Physics - if pressure inside a cylinder with a circular hatch is 2 atm and the ...
Dynamics - During a high-speed chase, a 2400-lb sports car traveling at a speed ...
physics - How fast must a 3000 lb car be traveling to hit a 4000 lb minivan on ...
physical science - A small car with a weight of 2000 lb traveling at 30 mph can ...
phy science - a 20,000kg railroad car is traveling at 3m/s when it collides and ...
physics - a 9000 kg railroad car moving at 3 m/s strikes a stationary 5000 kg ...
Physics - For a rollercoaster, a hydraulic catapult propels the car to the top ...
mechanical engineering - A railroad car that weighs 20,000 lb is traveling ...
Physics - The brakes of a certain 2400 lb car can exert a maximum force of 750 ...
For Further Reading
