A ball is thrown upwards (in the direction of the y-axis) with a velocity of 98 m / s from the roof of a 100 m high building. Find: a) The maximum height that the ball reaches above ground level. b) The time it took to reach the maximum height. c) The speed with which the ball hits the ground.

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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.