An archer aims at a target. (a) Should she aim the arrow directly at the target? Why or why not? Draw a simple diagram to support your explanation. (b) How should her angle of aim change depending on the distance to the target? (c) Suppose the archer's arrow is 1.2m above the ground, the bull's eye is 43m away and at a height of 1.8m, and she can shoot the arrow at an initial speed of 28m/s. It is a calm day with no wind so we ignore air resistance. At what angle should she aim her arrow to hit the bull's eye?

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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.