The image is not very clear. I had a difficulty in reading out the values....
from what I see, the angle is 21 degree , mass is 30 Kg , coefficient of friction is not clear. However, here is the method how to solve for required force.
Summing up the forces in x direction, we have
Fcos - uN = 0
In y direction
N = mg + Fsin
Put this N in first equation
Fcos - u (mg + Fsin) = 0
Therefore,
Just put the values....here is coefficient of friction, m is mass , g is 9.8, = 21
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