- #1
Drizzy
- 210
- 1
Homework Statement
a trailer with a mass of 150 kg happen to roll away with the speed 20 m/s. 450 kg cement fall staight down into the trailer! which speeds does the trailer get when the cement fall into it?
Homework Equations
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I know how to solve it but I don't know why it works. Is it because this counts as a collision?
The Attempt at a Solution
150 * 20 = V(150+450)