After the object reaches 40 m/s velocity, the man will stop pushing the object and the object will begin to slow down due the friction of the surface. The time of how long it takes the object to decelerate from an initial velocity of 40 m/s (when the man stops pushing the object) to a final velocity of 0 m/s when it comes to rest is of 20 seconds   Friction force = 188N     Measure the mass of the unknown object

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