4. An object at rest falls from a height of 65.0 m. It attains its terminal velocity after it had traveled 25.0 m. Neglecting air resistance, its terminal velocity is found to be 75 percent of its supposed velocity just before it hits the ground. (a) Find the terminal velocity of the body. (b) How long does it take, after reaching its terminal velocity, to reach the ground? Assume Newton's law of resistance holds.

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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.