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No acceleration.
Applied Force = Weight = M g
Applied Force = Weight = M g
The force of gravity on an object can be calculated using the formula:
F_gravity = mass × acceleration due to gravity
In this case, the mass of the briefcase is given as 9.0 kg, and the acceleration due to gravity is approximately 9.8 m/s^2.
So, F_gravity = 9.0 kg × 9.8 m/s^2 = 88.2 N
Since the professor lifts the briefcase at a constant speed, the force she exerts must be equal in magnitude but opposite in direction to the force of gravity. Therefore, the magnitude of the professor's force is also 88.2 N.