Question

the mechanical advantag of a class three lever is less than 1 but we use them

Answer 1

Explanation:

Although, mechanical advantage is less than 1 for calss-three levers, we still use them because the distance moved by the effort. For example, when a ball is hit with a bat, the ball ends up going faster than the speed with which the bat was swung. Therefore, class-three levers are called speed multipliers.

Answer 2

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Explanation: Class III levers have mechanical advantage less than one, but by using them we get a gain in speed, i.e. a larger movement of the load is obtained by smaller movement of effort arm. For example, the blade of a knife moves longer by smaller movement of its handle.