9. 2 kg glider is traveling toward the right with a speed of 1m/s on an air track. A 3 kg glider is traveling on the same trackto the left at 2 m/s. If they collide and stick together what speedwill they move with?

10. A car with a mass of 1000 kg is stopped at a stop sign. Thecar accelerates to 20 m/s in 5 seconds. (a) What is the magnitudeof the acceleration of the car during those 5 seconds? (b) How fardoes the car travel during those 5 seconds? (c) What is themagnitude of net force on the car while it is accelerating?

11. A skydiver jumps from a plane, 1 second after opening herparachute the resistive force on her has a magnitude of 1200 N. Ifthe skydiver has a weight of 800 N (and therefore a mass of 80 kg),what are the magnitude and direction of her acceleration?

12. A compact car with a mass of 1200 kg traveling at 20 m/shits a stationary SUV. The SUV has a mass of 2400 kg. (a) Whichvehicle experiences the greater force of impact? Explain youranswer. (b) Which vehicle has a greater acceleration during thecollision? Explain your answer. (c) Explain what additionalinformation is needed to determine the average force on the compactcar during the collision.

13. You throw a ball into the air. At its highest point it comesto rest, is it in equilibrium? Explain.