A 3.00-kg block starts from rest at the top of a 35.5° incline and slides 2.00 m down the incline in 1.45 s. (a) Find the acceleration of the block.

0.344 m/s^2

Explanation:

The first step is to calculate V

V= distance /time

= 2/1.45

= 1.379 m/s

Therefore the acceleration of the block can be calculated as follows

a= V - U/2d

= 1.379 - 0/2×2

= 1.379/4

= 0.344 m/s^2

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

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray