If a stone with an original velocity of zero is falling from a ledge and takes eight seconds that it the ground what is the final velocity at the stone

78.4 m/s

The formula for speed using known acceleration:

where the initial velocity v0 = 0 in this case, g is the gravitational acceleration and t is given to be 8 seconds, so:

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)