Arturo O. answered 10/29/18
Experienced Physics Teacher for Physics Tutoring
N = normal force = 180 N
F = applied force = ?
m = mass = 22 kg
g = acceleration of gravity = 9.8 m/s^2
N + Fsin(25 deg) = mg
F = (mg - N) / sin(25 deg)
Plug in the numbers for m, g, and N, and get your answer in newtons.