1) F = m.a
Here, F= 99N, a = 12.5 m/s^2
m = F/a
m = 99/12.5
m = 7.92 Kg
2) weight = mg
Here, m = 55 Kg, g = 9.8 m/s^2
W = 55*9.8 = 539 Newtons.
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