Speed is a scalar measure, a<span>nd only has magnitude </span>
If you add a direction to it <span>you are making it a vector.</span>
That is a synthesis reaction.
the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.
The answer is Joule. Kilograms and Grams is a unit for weight