Maria walked 1.5 miles south to her house in 0.5 hours. what is her speed in miles per hour?
what is her velocity in meters per second?

1) 3 miles/Hour

The speed is defined as the distance covered divided by the time taken:

where

d = 1.5 mi is the distance

t = 0.5 h is the time taken

Substituting,

2) 1.34 m/s south

Velocity, instead, is a vector, so it has both a magnitude and a direction. We have:

is the displacement in meters

is the time taken in seconds

Substituting,

And the direction of the velocity is the same as the displacement, so it is south.

the independent variable, or the one that is intentionally manipulated is the speed.

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