A student tosses a ball off the roof of the school at an angle 45 degrees above the horizontal. After the ball leaves the student's hand, it's motion can be described in terms of displacement, velocity, and acceleration. For each item, is the quantity constant, changing linearly, or changing nonlinearly during consecutive time intervals?

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

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C) the periods  of day and night would be fixed all year for anyone at the  equator