Answer:
1/2
Step-by-step explanation:
We know that F = ma, so F1 = m1.a1 and F2 = m2.a2.
F1 = 10
F2 = 20
To simplify things consider a1 = a2 = 1
To find m1 divide by a to both sides; m1 = F/a = 10/1 = 10.
To find m2 divide by a to both sides; 21 = F/a = 20/1 = 20.
Ratio of m1 to m2 = 10/20 = 1/2