![]() Professor Lewin shoots a bullet through two wires. Professor Lewin reviews when the velocity is zero, positive and negative he distinguishes speed from velocity.Ĥ. The instantaneous velocity is the derivative of the position with respect to time. The average velocity can be ZERO, while the average speed is LARGE.Ĭonsidering the incremental change in position x with time t, we arrive at v=dx/dt. He talks about average velocity, the importance of "+" and "-" signs, and our free choice of origin. Professor Lewin describes 1D motion of a particle.
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