Respostas

2013-10-02T18:22:14-03:00
Fr² = F1² + F2²
Fr² = 80² + 60²
Fr² = 6400 + 3600
Fr² = 10000
Fr = 100N

Fr = m*a
100 = 500 a
1/5 = a

a = 0,2m/s²