OCW Scholar - Physics I: Classical Mechanics 72 Online
OpenStudy (anonymous):

Module 4 Challenge Problem 5 : When I solve for t , I get ~2.1s. My approach is: v bus = a * t x person = v person * t = a * t^2 x bus = x0 bus + 1/2 a * t^2 = a * t^2 x0 bus = 1/2 a * t^2 2 = 1/2 * 0.9 * t^2 t = 2.1 What am I doing wrong?

OpenStudy (anonymous):

When the bus is 20m from the person it starts to accelerate at .9m/s^2, so for Bus: x(t)= 1/2at^2 and plug in 20 for x(t) and .9 for a and solve for t => t=6.7 secs.

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