A bow has an elastic constant of 250 N/m. The archer pulls the bow a distance of 85.0 cm from its rest position, then releases it to propel an 95.0 gram arrow. If all the elastic potential energy in the bow is transformed into kinetic energy, what would be the speed of the arrow? Select one: O a. 47.3 m/s O b. 61.7 m/s O c. 43.6 m/s O d. 30.8 m/s A car with a mass of 1.60 x 105 kg has 4.61 x 105 J of kinetic energy. What is the speed of the car? Select one: O a. 34.0 m/s O b. 17.0 m/s O c. 12.0 m/s O d. 24.0 m/sAn small electric motor lifts a 12.5 kg mass to a height of 4.243 rn in T51] s. What is the power output of the motor? Select one: C} a. 146 w G h. 1.25 W D c. 6.3? W D d. 5.26 W If an object undergoes a change in its kinetic energy, which of the following is true? Select one: D a. There must be a nonzero net force that has acted on the object. O b. There must be a change in the mechanicai energyr of the object. O c. There must be a corresponding change in the object's potential energy. D d. No force of friction can have acted on the object