A young girl with mass 35.5kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 86.0kg?m/s. Starting at 0s , a net force with magnitude F=( 8.35N/s )t and direction due west is applied to the girl.

Part A) At what value of t does the girl have a westward momentum of magnitude 56.5kg?m/s ?

Part B) How much work has been done on the girl by the force in the time interval from t= 0s to the time calculated in part A?

Part C) What is the magnitude of the acceleration of the girl at the time calculated in part A?