The definition of the velocity vector allows finding the correct answer for the velocity of the body is:
- A car travels east at 45 kilometers per hour.
Kinematics studies the motion of bodies, looking for relationships between position, velocity, and acceleration.
Velocity is defined as the change in position over time of the interval
v = [tex]\frac{\Delta x}{\Delta t}[/tex]
Where the bold letters indicate vectors, v is the velocity, x the vector position and t the time a scalar.
These magnitudes are vector, it has direction and sense, in the case of veloicity, the magnitude or modulus also called speed and the direction must be indicated to have the complete information of the vector.
Let's analyze the different phrases:
a. True. The 45 km/h module and the East is the direction are indicated, therefore the complete vector information is available.
b. False. The displacement is given, which is a vector, but it is not the velocity.
c. False. The module that is the speed 8m/s is indicated, but the direction is not indicated, therefore it is not a vector.
d. False. Distance is indicated, this is not velocity.
In conclusion using the definition of vector velocity we can find the correct answer for body velocity is:
- A car travels east at 45 kilometers per hour.
Learn more here: brainly.com/question/11290814
