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Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

What is the measurement of how fast an object moves relative to a reference point?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?