Superposition of waves

Steps:

• From the graph, the first wave has displacement +0.5 cm at t=0.3 s.
• The second wave has displacement -1.5 cm at t=0.3 s.
• Apply superposition: resultant displacement = +0.5 cm + (-1.5 cm) = -1.0 cm.
• This matches option B.

Why B is correct:

• Superposition principle requires algebraic sum of displacements, yielding -1.0 cm.

Why the others are wrong:

• A: Ignores negative sign of second wave.
• C: Adds magnitudes without signs (+0.5 + 1.5 = +2.0, but graph shows -1.5).
• D: Uses wrong magnitude for sum.

Final answer: B