Question

A triangular pulse moving at $2cm/s$ on a rope approaches an end at which it is free to slide on vertical pole. What is the particle speed at the free end at $\frac{3}{2}sec$ from the instant shown

• A. $2cm/s$
• B. $1cm/s$
• C. $3cm/s$
• D. $4cm/s$

Answer 1

The correct option is B $1cm/s$

Particle speed

$v_P=|-v\left(slope\right)|$

Here, v=wave speed$=2㎧$

Slope$=\frac{1}{2}$

Particle speed$=1㎝/s$