If a motorcyclist accelerates from rest to 40 m/s in 8 seconds, what is their acceleration? A: 5m/s^2
B: -5m/s^2
C: 320 m/s^2

please answer asap, this class is hard, is it multiplication? I have no idea. (doing test corrections)

the answer is a and have a great day

c, liquids evaporate, creating a gas

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.