Just started learning physics. Need some help understanding the difference between velocity and speed.
question: a car is constrained to move back and forth on a straight track. The car starts at position x=-150m at time t=0. The car moves 290m in a positive direction for 15 seconds at a constant speed. Then the car immediately reverses and travels 240m in the opposite direction for 25 seconds at a constant (but different) speed. What is the car's average velocity? Average speed?

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thank you :). Very easy to understand too.

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