An object is dropped onto the moon (g m = 5 ft/s 2 ). how long does it take to fall from an elevation of 250 ft.?

To determine the time needed in order for the object to reach a certain elevation we use the equation,
 
   d = V₀t + 1/2(gt²)

where d is the distance,
V₀ is the initial velocity which is equal to zero because the object is simply dropped
g is the acceleration due to gravity, and 
t is the time

If we derive the equation in order to solve for t, we have,
 
     t = sqrt ((2d/g))

If we convert the given in SI units,
   d = (250 ft) x (0.3048 m/ 1 ft) = 76.2 m
   g  = (5 ft/s²)(0.3048 m/ 1 ft) = 1.524 m/s²

Substitute,
 
      t = sqrt ((2)(76.2 m)/(1.524 m/s²))
      t = 10 s

Therefore, it will take 10 s for the object to be dropped to a distance of 250 ft. 

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .