physics mc X 2

Q1 冇左figure 5.2.

Q2 actually, to see the movement direction of particle in wave is very easy. when the wave travelling toward right, just see the point in the left hand side of this point. For Q, it is in 0.4cm RHS to the relative position, and in the next step, it will be same as P(same position as relative position). so Q is moving toward left.
Same method for Y, you may find that it will be change from 0(same position) to 0.6mm RHS, so it is moving toward right.
so the answer is D