Is the muzzle velocity a scalar or vector quantity?

What does the term discrediting mean?

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane