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= d (4t2) i - (3t2+4t) j / dt
= (8t)i - (6t+4)j
a = dv/dt
= d (8t)i - (6t +4)j
= 8i-6j
|a| = √x2+y2
= √ 82+62
= √64+36
= √100
= 10 m/s2