The mass of the body is 4.336 kg.
Resultant force
The resultant of the given two forces is calculated as follows;
[tex]R^2 = 25^2 + 45^2 - (2\times 25 \times 45) cos(70)\\\\R^2 = 1880.45\\\\R = \sqrt{1880.45} \\\\R = 43.36 \ N[/tex]
Mass of the body
The mass of the body is calculated by applying Newton's second law of motion as follows;
F = ma
m = F/a
m = 43.36/10
m = 4.336 kg
Thus, the mass of the body is 4.336 kg.
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