A block is sliding at a particular initial speed v when it encounters the following horizontal surfaces:

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A block is sliding at a particular initial speed v when it encounters the following horizontal surfaces: 

(a) A grass field, 

(b) An asphalt street, 

(c) A hardwood floor, 

(d) An ice rink (with real, not ideal, ice), and 

(e) An ideal, friction less surface. Draw qualitative plots of the velocity as a function of time for each case, with t = 0 corresponding to the time at which the block reaches each of these surfaces.

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