Resoluçao:

Fx = 5xcos60                                 Fy = 5xsen60
Fx = 5x0,5                                     Fy = 5x0,866
Fx = 2,5                                         Fy = 4,33

Fx = 3xcos0                                  Fy = 3xsen0
Fx = 3x0                                       Fy = 3x1
Fx = 0                                           Fy = 3

Fr = (2,5; 4,33) + (3; 0)
Fr = (2,5+3 ; 4,33+0)
Fr = (5,5 ; 4,33)
Fr² = (5,5)² + (4,33)²
Fr² = 30,25 + 18,7489
Fr² = 48,9989
Fr = 7N

Fr = m x a

7 = 2 x a

a = 7/2

a = 3,5 m/s²

Resposta: 7 N e 3,5 m/s².