5. Mrs. Steward wants to ignite the enthusiasm of the class with a homemade cannon demonstration, The 1.3 kg cannon is loaded with a 54 gram tennis ball and placed on the floor. Mrs. Steward adds the fuel, waits for its vapors to fill the reaction chamber and then brings a match nearby. The explosion stuns the crowd and propels the ball forward. A photogate measurement determines that the cannon recoiled backwards with a speed of 7.8 m/s. Determine the speed of the ball.​