A spaceship ferrying workers to Moon Base I takes a straight-line path from the earth to the moon, a distance of 384,000 km. Suppose it accelerates at an acceleration 20.4 m/s2m/s2 for the first time interval 15.5 minmin of the trip, then travels at constant speed until the last time interval 15.5 minmin , when it accelerates at −− 20.4 m/s2m/s2 , just coming to rest as it reaches the moon. A) What is the maximum speed attained? B) What fraction of the total distance is traveled at constant speed? C) What total time is required for the trip?

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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.