Answers by visitors named: Karan Jack

F=20N a1=8m/s^2 a2=24m/s^2 Let mass in first case be m1, and mass in second case be m2. 1st case, F=m1a2 m1=F/a1 =20/8 =5/2 2nd case, F=m2a2 m2=F/a2 =20/24 =5/6 Total mass=m1+m2 =5/2 + 5/6 =10/3 a=F/total mass =20/10/3 =20×3/10 =60/10 =6m/s^2.