yyyyyyyyy9126 yyyyyyyyy9126 29-05-2023 Physics contestada The position of an object as a function of time is given by x(t)=(4.2m/s3)t3â(4.0m/s2)t2+(65m/s)tâ7.0m Find the instantaneous acceleration at t=3.1s Find the average acceleration over the first 3.