A cargo helicopter, descending steadily at a speed of 4.5 m/s, releases a small package. Let upward be the positive direction for this problem. (a) If the package is 24 m above the ground when it is dropped, how long does it take for the package to reach the ground? (b) What is its velocity just before it lands? (Indicate the direction with the sign of your answer.)

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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.