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Solution 8.9a

Here we use r=ut+21at 2+r0 with

r0=1.5j m

u=15i+18j ms-1

a=−10j

t=3 s

Giving r=(15i+18j)3+21(−10j)3 2+1.5j

Simplifying r=45i+54j−45j+1.5j=45i+10.5j m