A bicycle moves along a straight road such that its position is described by the graph shown below, where s = t2 m for the first 10 seconds and s = 20t - 100 m from 10s to 30s. Construct the v- t and at graphs for 0 ≤ t ≤ 30s. s (m) 500 100 s = 20t - 100 10 30

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?