Water at the top of Horseshoe Falls (part of Niagara Falls) is moving horizontally at 9.0 m/s as it goes off the edge and
plunges 53 m to the pool below. If you ignore air resistance,
at what angle is the falling water moving as it enters the
pool?

Explanation:

Horizontal speed of water,

Height, h = -53 (below pool)

We can find firstly the final vertical speed of the water using third equation of kinematics. So

Let is the angle where the falling water moving as it enters the  pool. So,

Hence, the angle is (-74.42)°C.

d they tend to lose electrons and become cations.

explanation:

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