a block is pushed up

against the wall. Let the mass of the block be
m = 2.8 kg, the coefficient of kinetic friction
between the block and the wall be µ = 0.56,
and θ = 61◦
. Suppose F = 73 N.
The acceleration of gravity is 9.8 m/s
2
Find the force of friction.
Answer in units of N

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