# Salmon Passing a Waterfall#

A salmon accelerates from rest in still water at a depth of 3.53 $$m$$, to reach a velocity with components $$v\_{x} =$$ 1.65 $$m/s$$ and $$v\_{y} =$$ 7.31 $$m/s$$ when it jumps from the water to pass a waterfall.

## Part 1#

Select the known variables for the motion of the salmon until the point of leaving the water.

Select all the choices that apply.

Note: You will be awarded full marks only if you select all the correct choices, and none of the incorrect choices. Choosing incorrect choices as well as not choosing correct choices will result in deductions.

• Time interval for acceleration, $$\Delta t$$

• Vertical displacement, $$\Delta y$$

• Horizontal displacement, $$\Delta x$$

• Vertical acceleration component, $$a_y$$

• Horizontal acceleration component, $$a_x$$

• Vertical component of velocity at top of water, $$v_{fy}$$

• Horizontal component of velocity at top of water, $$v_{fx}$$

• Vertical component of velocity at bottom of water, $$v_{iy}$$

• Horizontal component of velocity at bottom of water, $$v_{ix}$$

## Part 2#

What is the salmon’s average acceleration as it moves through the water?

• $$(1.71\; m/s^2, 7.57 \; m/s^2)$$

• $$(7.57\; m/s^2, 1.71\; m/s^2)$$

• $$(0 \; m/s^2, 8.07\; m/s^2)$$

• 9.81 $$m/s^2$$

• $$(2.21\; m/s^2, 4.64\; m/s^2)$$

• 4.64 $$m/s^2$$