The position-time equation for a certain train is xf = 2.6m + (8.9m/s)7 + (2.5m/s^2)t^2 What is the initial velocity of this train and the acceleration?

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

positive reinforcement? ?

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.