1) While curling, you push a rock for 2.00 m and release it when it has a speed of 2.10 m/s. It continues to slide at constant speed for 0.800 s and then hits a rough patch of ice. It finally comes to rest 9.40 m from where it was released.
What was the curling rock's magnitude of acceleration after it hit the patch of rough ice?
2) A 2.00 kg toy rocket is launched from its platform and reaches a height of 260. m after 3.50 s. If the rocket motor only produced an upward acceleration for the first 0.500 s before running out of fuel, what was that initial upward acceleration? Neglect the effect of air resistance.