When Rosa uses the formula (vi cos)t to do a calculation then Rosa most likely trying to find the horizontal displacement of a projectile launched at an angle.
It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
The horizontal component of the velocity during any projectile motion is constant and is given by vicosθ.
When Rosa uses the formula (vi cos)t to do a calculation this means she is calculating the horizontal displacement as horizontal velocity is constant and when multiplied by the time it will give the horizontal displacement.
Thus, we get to know that Rosa most likely trying to find the horizontal displacement of a projectile launched at an angle.
Learn more about projectile motion from here
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