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OTP to be sent to Change
never
v = dr/dt = (2t-4)i +(2t)j v = velocity
a = 2i+2j a = acceleration
for a and v to be perpendicular,
=> a.v = 0 . is dot product
=> (2i+2j).[(2t-4)i+(2t)j] = 0
=> 4t -8 +4t = 0
=> 8t =8
i.e t=1
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