When the velocity increases, then the acceleration will be positive and when the velocity decrease then the acceleration will be negative.
During the first hour, the velocity was 70 mph and during the seconds hour the velocity was 60 mph. Hence, the velocity decrease in the seconds hour. So, the acceleration will be negative during the second hour.
Now, during the third hour the velocity increases as it is 80 mph. Hence, the acceleration will be positive during the third hour.
4. Dark Energy.
This is the mysterious force causing the expansion of space. No one has ever seen this force.
Answer:
if it were to be digital then you would be able to carry it around where ever and look at it to remind you of the memories, however it probably wouldnt last as long as the physical one. eg if you phone breaks there is a chance to restore the photo but you would had to have backed it up beforehand.
Answer:
it can cause wear and tear and reduces efficiency as energy is lost.
Explanation:
<span>
The taut guitar string haspotencial energy which we can see in action.</span> <span>· so option a is correct.</span>
