Q1. A small, 300 {rm g} cart is moving at 1.30 {rm m/s} on an air track when it collides with a larger, 3.00 {rm kg} cart at rest. After the collision, the small cart recoils at 0.890 {rm m/s}.
Q2. What is the right "motion camouflage" speed of approach for a dragonfly pursuing its prey at the angle 68.50 degrees? Typical speed is 0.750 m/s and 48.50 degrees.