Calculate the height of a cliff if it takes 2.25 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.01 m/s. (b) How long would it take to reach the ground if it is thrown straight down with the same speed?

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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.