An object is thrown vertically and has a speed of 25 m/s when it reaches 1/4 of its maximum height above the ground (assume it starts from ground level). what is the original launch speed of the object?

Explanation:

Conceptual analysis

We apply the kinematic formula for an object that moves vertically upwards:

Where:

: final speed in ft/s

: initial speed in ft/s

g: acceleration due to gravity in ft/s²

y: vertical position at any time in ft

Known data

For ,; where h is the maximum height

for y=h,  

Problem development

We replace    , in the formula (1),

[   Equation (1)

in maximum height(h): , Then we replace in formula (1):

  Equation(2)

We replace (h) of Equation(2) in the  Equation (1) :

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.