In the Olympics, the stone used in curling is about 20kg in mass and is launched down the ice at around 2 meters per second. The sweepers slow the stone down to 0.5 m/s just before it contacts the opponents stone. What is it’s KE at this point

A55-kg pilot flies a jet trainer in a half vertical loop of 1200-m radius so that the speed of the trainer decreases at a constant rate. knowing that the plane has a speed of 550 km/h at point a, and the pilot experiences weightlessness at point c (i.e., the normal force from the seat bottom is zero), determine (a) the deceleration of the plane, (b) the force exerted on her by the seat of the trainer when the trainer is at point b.