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A 535 kg automobile slides across an icy street at a speed of 54.5 km/h and...

A 535 kg automobile slides across an icy street at a speed of 54.5 km/h and collides with a parked car which has a mass of 892 kg. The two cars lock up and slide together. What is the speed of the two cars just after they collide? (in km/h)
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Answer #1

applying law of conservation of momentum,

535*54.5=(535+892)v

or v=20.433 km/hr

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