Can someone please help explain and solve these problems about force diagrams? Thank you so much

Force Diagrams... net = ma 9 = Fnet / m Solve for the unknown values. wema 1 . 515(50) TEN = 490N Ff = -> FP = 20 N Ff = 5N 50kg Fp = 20N Fg = 49ON What is the acceleration of the block? 150m(52 2. Ff = 5N kg Fp = 15N What is the mass of the block if its acceleration is 5m/s?? 3. Ff = N 5kg Fp = 20N What is the force of friction acting on the block is the acceleration is 2m/s? 4. Ff = 5N N 50kg Fp = What is the applied force if the acceleration of the block is 5m/s