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During a cross country meet a spectator (mass = 80 kg) was walking at a velocity...

During a cross country meet a spectator (mass = 80 kg) was walking at a velocity of 1.5 m/s while texting and didn’t realize he walked into the path of the race. A runner with a mass of 70 kg collides head on with the spectator while sprinting at 5 m/s in the opposite direction. Let’s pretend that when they collided it was an inelastic collision. What is their post-impact velocity?

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From the law of conservation of linear momentum The post impact velocity is (80) (1.50 m/s)+(70 kg)(-5 m/s) (80 kg)+(70 kg) 1.53 ms

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