An object with a mass of 3kg has a momentum of 75 kg m/s what is its velosity

                      Momentum = (mass) x (velocity)

Since we have no information about the object's direction,
the best we can do is use the magnitude of its momentum
and find it's speed.

               Magnitude of Momentum = (mass) x (speed)

For this object,             (75 kg-m/s) = (3 kg) x (speed)

Divide each side by (3kg):

                         (75 kg-m/s) / (3 kg)  =  Speed

                                             Speed  =  25 m/s .

                                                  (about  56 mph)