At some airports there are speed ramps to passengers get from one place to another. a speed ramp is a moving conveyor belt on which you can either stand or walk. suppose a speed ramp has a length of 118 m and is moving at a speed of 1.9 m/s relative to the ground. in addition, suppose you can cover this distance in 76 s when walking on the ground. if you walk at the same rate with respect to the speed ramp that you walk on the ground, how long does it take for you to travel the 118 m using the speed ramp?

It takes 34.173 s

Explanation:

This is a relative movement exercise.

We are going to use that :

And the relative movement velocity equation :

Given a particle P, and two reference systems A and B in which we know the velocity from system B relative to A and the velocity of P relative to B :

Don't forget that this is a vectorial equation.In our exercise the person velocity and the speed ramp velocity have the same direction so we turn the vectorial equation into a scalar equation.

We can cover 118 m in 76 s ⇒

This will be our speed relative to the speed ramp

We use the equation (in terms of speed) :

Then →

explanation:

newton's third law, for every action there is an equal and opposite reaction.

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.