1 )   In a stationary wave pattern that forms as a result of reflection of waves from an obstacle the ratio of amplitude of an antinode and a node is 1.5   What percentage of the energy passes across the obstacle?

2  )  A uniform string of lenght L and total mass M is suspended vertically and a transverse pulse  is given at the top end of it . At the same moment a body is released from rest and falls freely from the top of the string. how far  from the bottom does the body pass the pulse ?

thank you

For the second one,

T--write for dm mass and x distance from the top,M/L is constant equate,Vt=1/2gt²,find t and put in any equation.