A tennis ball with a mass of .058kg is launched from a catapult with an initial speed of 6.8 m/s and an initial height of 1.3 meters. Assuming level ground, what is the final speed of the ball right before it strikes the ground? 2. A student pulls on a cart and applies a 20N force at an angle of 25 degrees above the horizontal to move a crate a distance of 10m across a rough floor that creates a frictional force of 2N. (A) How much work does the student do? (B) What is the total work done? (C) If the cart starts at rest how fast is it going after 10m?