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Q1. A 1040 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 2.0 m apart that causes the car to bounce on its spring suspension. The car bounces with maximum amplitude as its speed is 21 km/h. The car now stops, and the four people get out. By how much does the car body rise on its suspension owing to this reduce in weight?

Q2. A 0.8 kg particle has a speed of 3.9 m/s at point A and kinetic energy of 11.8 J at point B. What is its kinetic energy at A?

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