A 15kg dog jumps out of a 40 kg canoe. If the dog's velocity is 1.2 m/s, what is the velocity of the canoe

the velocity is 0.45 m/s and it is moving in the opposite direction

or

-0.45 m/s

Explanation:

The law of conservation of momentum says that  initial momentum = final momentum

( mass x velocity of the dog ) = - (mass x velocity of the canoe)

(15 x 1.2) =- (40 x velocity of the canoe)

Velocity of the canoe = -(15 x 1.2) / 40 = -0.45 m/s

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.