Acoin which is tossed straight up into the air. after it is released it moves upward, reaches its highest point and falls back down again. air resistance can be neglected. what force acts upon the coin when it is at its highest point?

a. force acting up and increasing
b. force acting up and constant
c. force acting down and decreasing
d. force of zero
e. force acting down and increasing
f. force acting down and constant
g. force acting up and decreasin

f. Force acting down and constant

Explanation:

At the highest point, the coin will start to free fall and in free fall only force of gravity act, which is always acted downward and its magnitude is mass times g. g=9.81 m/s^2. which makes the force constant.

therefore, the correct answer will be f. Force acting down and constant

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