Question

Mature salmon swim upstream, returning to spawn at their birthplace. During the arduous trip they leap vertically upward over waterfalls as high as 2.87 m. With what minimum speed (in m/s) must a salmon launch itself into the air to clear a 2.87-m waterfall?

Answer 1

Answer:

The minimum speed is 7.5 m/s.

Explanation:

Given that,

Height = 2.87 m

We need to calculate the minimum speed

Using equation of motion

$v^2=u^2-2gh$

$u=\sqrt{2gh}$

Where, u = minimum velocity

g = acceleration due to gravity

h = height

Put the value into the formula

$u=\sqrt{2\times9.8\times2.87}$

$u=7.5\ m/s$

Hence, The minimum speed is 7.5 m/s.