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posted by garrett on Sunday, March 30, 2014 at 11:11pm.
a 1500 kg car moving at 20 m/s strikes a truck waiting at a traffic light, hooking the bumpers. The two continue to move together at 10 m/s. What was the mass of the truck?
1500 * 20 = (1500+m)10 m = 1500
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