A. Chemical energy into thermal energy
Answer:
1. the graph is showing the speed of the object at different times.
Explanation:
2. the object is slowing down
Answer:
so the exact time can be measured
Explanation:
if it is not used then let's say 2 athletes finish the race at the time 20 second so it won't be exact and you would not know who is first and if it is used then you even know how much or which part of the second it is, hope you understand . brainy plzz