Answer
$4.0\,ms^{-2}$
Work Step by Step
According to Newton's second law of motion,
$F=ma$ or $a=\frac{F}{m}$
Given: F= 6.0 N and m=1.5 kg
Then object's acceleration $a=\frac{6.0\,N}{1.5\,kg}=4.0\,ms^{-2}$
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