Walker, Halliday & Resnick — Kinetic Energy and Work: Problem 16

16 A 7.0 kg object is moving in the positive direction of an x axis. When it passes through \( x = 0 \), a constant force directed along the axis begins to act on it. Figure 7-22 gives its kinetic energy \( K \) versus position \( x \) as it moves from \( x = 0 \) to \( x = 5.0 \text{ m} \); \( K_0 = 30.0 \text{ J} \). The force continues to act. What is \( v \) when the object moves back through \( x = -3.0 \text{ m} \)?