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Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?
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Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.
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What is the quantity which is measured by the area occupied below the velocity- time graph?
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Explain why some objects fall faster than other objects,...
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