A person walks first at a constant speed of 5.40 m/s along a straight line from point to point and then back along the line from to at a constant speed of 3.10 m/s. (a) What is her average speed over the entire trip

The average speed over the entire trip is 3.94 m/s

Explanation:

As we know :

Let the distance of straight line from point to point be = d

Total distance covered = 2d

Time taken to cover the forward journey =

Time taken to cover the backward journey =

Total time for the journey = Time taken to cover the forward journey  + Time taken to cover the backward journey  =

Average speed =

Thus  average speed over the entire trip is 3.94 m/s

i need the answer to this too but idk it ; -;

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray