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OpenStudy (anonymous):
find time when instantaneous velocity becomes perpendicular to instantaneous acceleration and to the initial velocity given: U=30i+60j a=-10j i have got these things: Vx+Vy=30i +(60-10t)j x=30t y=60-5t^2 but i m having problem in finding the answer :'(
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OpenStudy (anonymous):
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