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Dear Nikhil
For sign of u see the slope (dx/dt) is positive or negative
at t1 slope is +ve u will be +ve
at t2 slope is zero , u will be zero
at t3 slope is -ve, u will be negative
For sign of ax (d2x/dt2) see whether curve is concave upwards or downwards
at t1 and t3 it is concave upwards hence ax is +ve
at t2 it is concave downwards hence ax is -ve
All the best.
AKASH GOYAL
AskiitiansExpert-IITD
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Hi Shashank,
Please complete you question what exactally you want to know.
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