In a demolition derby, a car of mass M kg and velocity 5.75 m/s crashes into a car of mass 1713.51 kg that was stalled on the track. After the collision, the two cars move down the track, stuck together, at a velocity 1.4 m/s. What was the mass M, in kg, of the car that was initially moving? a. 460 b. 550 c. 1900 d. 2300

In a demolition derby, a car of mass M kg and velocity 5.75 m/s crashes into a car of mass 1713.51 kg that was stalled on the track. After the collision, the two cars move down the track, stuck together, at a velocity 1.4 m/s. What was the mass M, in kg, of the car that was initially moving? a. 460 b. 550 c. 1900 d. 2300

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter10: Systems Of Particles And Conservation Of Momentum

Section: Chapter Questions

Problem 48PQ

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a man of mass m1 = 70.0 kg is skating at v1 = 8.00 m/s behind his wife of mass m2 = 50.0 kg, who is skating at v2 = 4.00 m/s. Instead of passing her, he inadvertently collides with her. He grabs her around the waist, and they maintain their balance. (a) Sketch the problem with before-and-after diagrams, representing the skaters as blocks. (b) Is the collision best described as elastic, inelastic, or perfectly inelastic? Why? (c) Write the general equation for conservation of momentum in terms of m1, v1, m2, v2, and final velocity vf. (d) Solve the momentum equation for vf. (e) Substitute values, obtaining the numerical value for vf, their speed after the collision.