A soft tennis ball is dropped onto a hard floor from a height of 1.85 m and rebounds to a height of 1.41 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. 3.5 m/s - WRONG (b) Calculate its velocity just after it leaves the floor on its way back up. 6.02 m/s - WRONG (c) Calculate its acceleration during contact with the floor if that contact lasts. 3222.76 - RIGHT (d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid? ???

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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.