The duration of the ball's contact with the ground cannot be calculated without knowledge of mass.
We see mass in everything around us. For instance, objects like a table, chair, bed, football, glass, and sometimes even air have mass. All items have mass, which determines whether they are light or heavy.
An object's mass is determined by how much matter it has. Anything that has more substance will weigh heavier overall. For instance, because an elephant contains more stuff than a mouse does, it has a heavier mass. However much matter an object contains is not determined by size.
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