direction ................................................................
I believe it’s stay in motion if it’s not acted on by an unbalanced force
You have to do the math of each and see which one adds up to 66.5
A and B are equivalent. That's one way instruments are often grouped. (the "sopranos", the "altos", the "bass")
C is another way instruments are often grouped; (the "woods", the "brass")
D is another way instruments are often grouped; (the "strings", the "percussions")
I am quite sure the first one is Friction, but I am not sure about the second one. Is it wind?
