Question

The height of the upper falls at Yellowstone Falls is 33 m. When the water reaches the bottom of the falls, its speed is 26 m/s. Neglecting air resistance, what is the speed of the water at the top of the falls?

Answer 1

Speed of water at the top of fall = 5.40 m/s

Step-by-step explanation:

We have equation of motion

`v^2=u^2+2as`

Here final velocity, v = 26 m/s

a = acceleration due to gravity

`a=9.8m/s^2 \\`

displacement, s = 33 m

Substituting

`26^2=u^2+2* 9.8 * 33\\\\u^2=29.2\\\\u=5.40m/s \\`

Speed of water at the top of fall = 5.40 m/s