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∑F = m.a
Fp = 5. (-9,81) = - 49,05 N. casi. - 49 N
a)
Fc = 49 N
Ftot = 49 - 49 = m.a
a = 0 m/s^2
b)
Fc = 39 N
Ftot = 39 - 49 = m.a
a = -10/5
a = -2 m/s^2
c)
Fc = 59 N
Ftot = 59 - 49 = m.a
a = 10/5
a = 2 m/s^2