Question 11 5 pts An object of mass m is moving on a horizontal rough surface. At a certain point it has a speed v m/s and it comes to a stop after traveling 18 m. If the coefficient of friction between the object and the surface is 0.40, what is the value of speed v? Use g = 10 m/s2. O 12 m/s O 38 m/s O 10 m/s O 26 m/s O 32 m/sQuestion 12 5 pts A 600-g mass traveling at 8.0 m/s undergoes a head-on elastic collision with a 200-g mass traveling toward it also at 8.0 m/s. What is the speed of the 200-g mass after the collision? O 4.0 m/s 8.0 m/s 0 0m/s O 16 m/s O 15 m/s