Suppose that a passenger intent on lunchduring his first ride in a hot-air balloon accidently drops an appleover the side during the balloon’s liftoff. At the moment of the apple’s release, the balloon is accelerating upward with a magnitudeof 4.0 m/s2 and has an upward velocity of magnitude 2 m/s.What are the (a) magnitude and (b) direction of the acceleration ofthe apple just after it is released? (c) Just then, is the apple movingupward or downward, or is it stationary? (d) What is the magnitudeof its velocity just then? (e) In the next few moments, does thespeed of the apple increase, decrease, or remain constant?

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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.