volume_mute

A 2000-pound car moving at 50 miles per hour collides with a stationary car weighing 3000 pounds

publish date: 2023/08/04 21:43:00 GMT+10

volume_mute

If the two cars stick together, what is their speed immediately after the collision?

Hint: On both sides of the equation, you may use "pounds" for mass and "miles per hour" for velocity.  This is permissible because weight (pounds) is proportional to mass, and miles/hour is a legitimate unit of velocity.)

miles/hour

Correct Answer

(1) 20

Explanation

(2000 lb • 50 mi/hr) + (3000 lb • 0) = 5000 lb•v

100,000 lb•mi/hr = 5000 lb•v

v = 20 mi/hr

Reference

Basic Physics: A Self-Teaching Guide

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