Question

why in a Lever of third order there is always gain in speed​

Answer 1

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Third class levers are used in applications where speed is important. Because a larger force is applied by the effort, the load travels a further distance. Since the load travels a further distance, its speed is also multiplied.

Answer 2

Third class levers are used in applications where speed is important. Because a larger force is applied by the effort, the load travels a further distance. Since the load travels a further distance, its speed is also multiplied.