order to find the magnitude of the acceleration due to gravity on some anet, NASA and the CSA invented a simple device which launches a mall metal ball straight up with an initial speed of 10.25 m/s. The evice then times how long the metal ball is in the air before returning to he device. f on the planet, the ball takes 4.2 s to return to the device (and we neglect air resistance) what is the magnitude of the acceleration due to gravity on that planet? Your Answer: Answer units

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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.