The diagram shows two pulses of equal width and height travelling in opposite directions on the same string. Draw the shape of the string when the pulses completely overlap.

The diagram shows two pulses of equal width and height travelling in opposite directions on the same string. Draw the shape of the string when the pulses completely overlap.

The wave pulses shown in the diagram travel at $1 \mathrm{cm} {\mathrm{s}}^{-1}$ and both have width $2 \mathrm{cm}$. The heights are indicated on the diagram. In each case, draw the shape of the resulting pulse according to the principle of superposition at times $t=0.5 \mathrm{s}$, $t=1.0 \mathrm{s}$ and $t=1.5 \mathrm{s}$. Take $t=0 \mathrm{s}$ to be the time when the pulses are about to meet each other.

Two waves are simultaneously generated on a string. The graph shows the variation of displacement $y$ with distance $x$. Draw the actual shape of the string.