4. An arrow is launched straight up from the ground with an initial velocity of 23.4 m/s. How long until it reaches its highest point?
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If shot straight up at 80m/s, it will take approximately 8 seconds to lose all of its vertical velocity (because gravity steals about 10m/s from it, every second!) Then, it will take just as long to fall back down. This assumes that there is no air friction, no tumbling, constant gravity, planet Earth, etc.
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