Astudent on her way to school walks eastward in a straight line 20.0 meters towards the bus stop, but realizes she dropped her physics notebook along the way and turns around to retrace her steps. she has traveled back 18.0 meters before finding it and then runs the remaining 45.0 meters due east to the bus stop. what is her total displacement? what is her total distance traveled?

Total displacement will be 47 meter

Total distance will be 83 meters

Explanation:

We have given that first the student go eastward towards bus stop 20 meters

But he realizes that she dropped his physics notebook and so h=she turns back along the same way up to 18 meters

So displacement = 20-18 = 2 meters

And he travel 45 meters in east along the bus stop so total displacement = 45+2 = 47 meters

Total distance traveled by the student = 20+18+45 = 83 meters  

whichever one it is, it's definitely not one that you included on the list you provided.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: