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OpenStudy (anonymous):
A particle's position as a function of time t is given by r⃗ =(5.0t+6.0t2)mi+(7.0−3.0t3)mj. At t=5.0s, find the magnitude of the particle's displacement vector Δr⃗ relative to the point r⃗ 0=(0.0i+7.0j)m. At t=5.0s, find the angle of the particle's displacement vector Δr⃗ relative to the point r⃗ 0=(0.0i+7.0j)m. Help please i'm stuck
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