Answer
Magnitude of acceleration
a = 0.87521 m/s$^2$
Work Step by Step
Since acceleration
a = 0.86 i - 0.1625 j m/s$^2$
Magnitude is given by
a = sqrt (0.86$^2$ + 0.1625$^2$)
a = 0.87521 m/s$^2$
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