If stroke length is 18 inches and rod speed is 3 inches per second, extension time is approximately 6 seconds.

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Multiple Choice

If stroke length is 18 inches and rod speed is 3 inches per second, extension time is approximately 6 seconds.

Explanation:
Extension time comes from the basic relation time = distance ÷ speed. Here, the rod must travel 18 inches, and it moves at 3 inches per second, so the time = 18 ÷ 3 = 6 seconds. This calculation assumes constant speed throughout the stroke and that the full 18 inches are covered without delays at the ends. So the extension time is six seconds.

Extension time comes from the basic relation time = distance ÷ speed. Here, the rod must travel 18 inches, and it moves at 3 inches per second, so the time = 18 ÷ 3 = 6 seconds. This calculation assumes constant speed throughout the stroke and that the full 18 inches are covered without delays at the ends. So the extension time is six seconds.

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