We have that the time in seconds, minutes, and hours is



From the Question we are told that
Velocity 
Distance 
Generally the equation for the Time is mathematically given as
Therefore


And


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It starts or speeds up.
Some substances need certain amount of energy in order to react with each other.
Answer:
The (s) indicates that the state of matter for NaHCO3 is solid.
Explanation:
When a chemical reaction is written, the state of matter for each components of the reactants and products are mentioned in brackets along with their names or formulas.
For example, NaHCO3 has (s) mentioned in the brackets. The s shows that the state of matter for NaHCO3. (l) represents liquid format. (g) represents that the state of matter is gas.