Fig. 144.9 shops to wave pulses travelling along a string in the opposite directions. The velocity of the wave is 3 m/s and the pulses are 9cm apart. Find what has hap-pened to the energy at t=1.5s.

Explanation

To solve the problem, we need to analyze the wave pulses traveling along a string and determine what happens to the energy at \( t = 1.5 \) seconds. Here’s a step-by-step breakdown of the solution:

### Step 1: Calculate the distance traveled by the wave pulses
The distance \( d \) traveled by the wave pulses can be calculated using the formula:
\[ d = v \times t \]
where:
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