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Physics 10 Online
OpenStudy (anonymous):

A particle's position as a function of time t is given by r =(5.0t+6.0t2)mi^+(7.0−3.0t3)mj^. At t=5.0s, find the magnitude of the particle's displacement vector Δr relative to the point r0=(0.0i^+7.0j^)m. At t=5.0s, find the angle of the particle's displacement vector Δr relative to the point r0=(0.0i^+7.0j^)m.

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