Suppose that glider A100 has initial momentum 3 kg·m/s to the right and final momentum very nearly equal to 3 kg·m/s to the left. What is the final momentum of glider B100 (specify both direction and approximate magnitude)? Show your work.

Explanation:

From the given information:

The initial momentum of glider A100 = 3 kg.m/s

The final momentum of glider A100 = 3 kg.m/s

The change in the momentum of A100 = The gain in the momentum of B100

              A                 B              system

Initial                  Zero            

Final                                

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the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form