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Which is more reliable—using a manual stop watch or using light gates? Explain.
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Which is more reliable—using a manual stop watch or using light gates?
Explain.

User Ashraf Patel
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Light gates are more reliable. When using a manual stop watch, it is difficult to stop it at an exact time. A light gate is able to detect when an object passes through a 'gate' with the infrared transmitter and receiver. 
User Pavan Jaju
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