A child is sending pulses down a stretched rope at a rate of 2 pulses per second. The distance between the pulses is 5 meters. What is the speed of the wave?

The 2 pulses per second give a frequency of 2 Hz. The 5-meter distance between successive pulses is the wavelength. Using wave speed = frequency × wavelength, the speed is 2 × 5 = 10 m/s, so the correct choice is 10 m/s.

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