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

Answer:

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

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

$26^2=u^2+2\times 9.8 \times 33\\\\u^2=29.2\\\\u=5.40m/s$

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