The driver's manual says a tire car in good condition and at a speed of 80 km / h can stop at a distance of 56.7 m. The corresponding distance for the speed of 48 km / h is 24.4 m. Suppose the driver's reaction time, during which acceleration is zero, independent of the speed of the automobile and that acceleration when the brakes are applied to be the same for the two speeds. Calculate: a) The driver's reaction time; b) The acceleration of the car. Answer: a) 0.73s b) 6.2 m / s²

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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.