Question

.

Answer 1

Force = mass x acceleration
therefore mass = force / acceleration
so take any point along the line
divide the force (x) by the acceleration (y) = answer

Answer 2

2 points: (0.5 , 2) and ( 1, 4)
so 0.5 /2 = 0.25 kg
and 1/ 4 =0.25 kg

so answer = 0.25 kg = 250 grams