1. The problem statement, all variables and given/known data 1. The problem statement, all variables and given/known data A train slows down as it rounds a sharp horizontal turn, slowing from 90.0 km/h to 50.0km/h in that 15.0s that it takes to round the bend. The radius of the curve is 150m. Compute the acceleration at the moment the train speed reaches 50.0 km/h. Assume that it continues to slow down at this time at the same rate. 2. Relevant equations Kinematics Circular Motion 3. The attempt at a solution I understand we have to add the tangential acceleration to the centripetal acceleration. Can I just treat this motion as a straight line to compute the tangential acceleration? Can we do this for most problems like this? If so, then the tangential acceleration is -2.67 m/s^2. Then the total acceleration is 2.96 m/s^2 64.28 degrees of the radius.