1) a=(v2-v1)/(t2-t1)=(2.88-1.44)/(1.6-0.8)=1.8
F=m*a=94*1.8=169.2
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2) a=v²/(2*s)
m=F/a=F*2*s/v²=55*2*18/8²=30.9
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3) a=2*s/t²=2*13/12²=0.2
F=m*a=83*0.2=16.6
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Verified answer
1) a=(v2-v1)/(t2-t1)=(2.88-1.44)/(1.6-0.8)=1.8
F=m*a=94*1.8=169.2
===================
2) a=v²/(2*s)
m=F/a=F*2*s/v²=55*2*18/8²=30.9
====================
3) a=2*s/t²=2*13/12²=0.2
F=m*a=83*0.2=16.6
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