The step pulleys shown in the figure below are connected by a crossed belt. If the angular acceleration of C is 2 rad/s^2, what time is required for A to travel 180ft from rest? Through what distance will D move while A is moving 240ft/s? Answer for tA should be 6.71 sec and SD should be 180 ft

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.