given :-
Fgrav = 40 N and g = 10 m/s/s
so mass of the object = m = Fgrav / g = 40 / 10
m = 4 kg
now according to newton's second law
Fnet = m *a
Fapp - Ffrict = m * a
35 - 15 = 4 * a
a = 20 / 4
a = 5 m/s/s <<<< Answer
feel free to drop comment if you have any doubt.
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