When there is no air resistance what best describes the vectors of a projectile in motion:   a.The acceleration vector and velocity vector are both constant magnitude.   b.The acceleration vector is constant magnitude and perpendicular to the trajectory. The velocity vector is at a tangent to the trajectory   c.The acceleration vector is constant and points straight down. The velocity vector is perpendicular to the trajectory   d.The acceleration vector is constant and points straight down. The velocity vector is at a tangent to the trajectory

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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.