Traffic shock wave. An abrupt slowdown in concentratedtraffic can travel as a pulse, termed a shock wave, along theline of cars, either downstream (in the traffic direction) or upstream,or it can be stationary shows a uniformlyspaced line of cars moving at speed v = 25.0 m/s toward a uniformlyspaced line of slow cars moving at speed vs = 5.00 m/s.Assume that each faster car adds length L = 12.0 m (car lengthplus buffer zone) to the line of slow cars when it joins the line, and assumeit slows abruptly at the last instant. (a) For what separation distanced between the faster cars does the shock wave remainstationary? If the separation is twice that amount, what are the (b)speed and (c) direction (upstream or downstream) of the shock wave?

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Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.