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) :

its c its is a mixture of gases

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.