According to newton's second law;
"F=ma"
Therefore; "M1=\\frac{F}{a}=\\frac{72}{5}=14.4kg"
"M_2=\\frac{5}{20}M_1=\\frac{5}{20}\\times14.4=3.6kg"
"a=\\frac{F}{(M_1+M_2)}=\\frac{72}{(14.4+3.6)}=4m\/s^2"
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