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∑F = ma (velocidad constante = aceleración 0)
Luego para hallar las fuerzas (Hacer el D.C.L)
∑Fx = 0
Fr - mg x sen40º = 0
Fr = mg x sen40º ------ (1)
∑Fy= 0
N - mg x cos40º = 0 ------ (2)
1)
Fr = mg sen40º
Fr = 15 kg x 9.81m/s^2 x sen40º
Fr = 94.59 N
Fr = 95 N