An air track is tilted so that it makes a small angle with the horizontal. An air cart of mass 0.05 kg is given an initial velocity of 5 m/s as measured by photogates. It travels 5 m in 2 seconds up the air track. As the cart moves up the air track, it is observed to slow down and momentarily come to rest. It then begins to slide down the track. Assume negligible friction. What is the speed of the cart when it reaches its starting point again? What is the magnitude of the acceleration for the air cart?