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A car travels from New York to Philadelphia (100 km) at an average speed of 100 km/h, instantly turns around, and travels back to New

A car travels from New York to Philadelphia (100 km) at an average speed of 100 km/h, instantly turns around, and travels back to New York at an average speed of 100 km/h. Its average speed over the whole trip is 4.2. Motion Question 18 options: a) zero b) 50 km/h c) 100 km/h d) 200 km/h

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