A rocket is launched from rest from an underwater base a distance of 125 m below the surface of a body of water. It moves vertically upward with an unknown but assumed constant acceleration (the combines effect of its engines, Earth’s gravity, and the buoyancy and drag of the water), and it reaches the surface in a time of 2.15 seconds. When it breaks the surface its engines automatically shut off (to make it more difficult to detect) and it continues to rise. What maximum height does it reach? (Ignore any effects at the surface.)

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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.