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44) A long spring is attached to a wall. A student generates a pulse 20cm high. When the pulse hits the wall it bounces back upside-down. If a student creates another 20cm pulse, what will be the effect
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44) A long spring is attached to a wall. A student generates a pulse 20cm high. When the pulse hits the wall it bounces back upside-down. If a student creates another 20cm pulse, what will be the effect when the two pulse meet?

User TomCB
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You can think of the upside down (returning) pulse as negative (-20cm) and the new pulse as positive (+20).  All waves traveling along the spring will add to each other at each point they meet.  What will happen when you add these two numbers?
User Brian Newman
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