4. A space probe travels far out into the deep space of the Milky Way where the force of gravity is negligible. The probe has a mass of 3. 8 x 10 * kg and an initial speed of 1. 57 * 10 * m/s . The probe's engine exerts a force of 2. 6 x 10 N in the original direction of motion as the probe travels a distance of 2. 8 x 10 m. a) Describe in words the strategy you will use to determine the final speed. Explain any assumptions you are making b) Determine the final speed of the probe. Show your work