Both magnitude and DIRECTION
For example,
• 12m East
• -2 miles
•9 meter north
• 8 miles up
Acceleration on a velocity time graph is found by calculating the change in the velocity over the change in time, or in other words, the slope. To do so, it's (final v-initial v)/(final t-initial t), where v is the velocity and t is time. Just find the final point you are looking for on the velocity time graph and determine its velocity and time. Then do the same for the initial point on the velocity time graph. Subtract the final velocity from the initial velocity and divide it by the final time minus the initial time and you will find the velocity for that interval. If you are looking for the instantaneous velocity at one specific point and not a interval, it's just the slope of the line at that point in time.
When bonds form or break, it is called a chemical change. Which changes the substance completely and it cannot go back to the original substance.
Therefore, to answer this question correctly, we must find a physical property. Which can be a change in state and doesn't change the substance by breaking bonds or forming new bonds.
D. Boiling and melting
Explanation:
Because when you melt, you change the physical state. Also when you boil something, you are not changing the bonds. That is because you can change it back to its original substance. It is a temperature change which makes it melt or boil.
Hope I helped. :)
