1:29 : What If? What would the minimum value of the coefficient of static friction need to be for the system not to move when released from rest? DETAILS SERPSE10 6.A.OP.021. MY (a) A roller-coaster car has a total mass (including passengers) of 505 kg. Sitting in the car is a passenger with a mass of 51.0 kg. The car reaches the lowest point of a circular arc in the track, point A in the figure below, mov speed of 13.0 m/s. The radius of the arc is r, = 27.0 m. What is the magnitude (in N) and direction of the force that the seat exerts on the passenger at point A? magnitude N direction --Select-- (b) What If? If the car has the same speed at point A as in part (a), what would the radius (in m) of the track have to be for the force of the seat on the passenger at this point to be twice the passenger's weight? m FEB 20 OB E N A OUT MacBook Air G 44 DII DD 4 20 Q FB F12 esc F2 F3 FA F7 % &