please. help mw with his physics 20 (grade11) quiz

I HAVE A TIME LIMIT

Question 7 Two girls, X and Y, are seated on identical skateboards on a smooth, horizontal surface. The masses of the girls Not yet are 60 kg and 50 kg, respectively. If girl X pushes hard to the right with her feet on girl Y, what will happen? answered X Marked out of 1.00 Flag left . . right question O Select one: O a. Girl X will move to the left at a greater speed than girl Y will move to the right. O b. Girl X will move to the left with the same speed as girl Y will move to the right. O c. Girl X will remain stationary and girl Y will move to the right. O d. Girl X will move to the left at a smaller speed than girl Y will move to the right.Question 9 Which of the following statements about the coefficients of static friction and kinetic friction, is correct? Not yet answered Select one: Marked out of 1.00 O a. Both the coefficient of static friction and kinetic friction depend on whether the surface is wet or dry. Flag O b. For the same pair of surfaces in contact, the coefficient of static friction is usually smaller than the question coefficient of kinetic friction. O c. Both the coefficients of static and kinetic friction depend on the area of the surfaces in contact. O d. Both the coefficients of static and kinetic friction are proportionality constants and have the same value.Question 10 If the magnitude of the net force acting on the object illustrated below is 63.0 N, the magnitude Not yet answered of the force due to friction is N. Express your answer to three significant figures. Marked out of 1.00 Flag question 50.0 N ? N + 50.0 N Direction of motion