A Block Is Projected with Speed V Across a Horizontal

question 21

Multiple Choice

A block is projected with speed v across a horizontal surface and slides to a stop due to friction. The same block is then projected with the same speed v up an incline where it slides to a stop due to friction. In which case did the total mechanical energy of the block decrease the least?

• A) This problem cannot be solved since it was not indicated whether the horizontal surface and the incline both had the same coefficient of kinetic friction.
• B) The case on the horizontal surface had the least decrease in total mechanical energy.
• C) The case on the inclined surface had the least decrease in total mechanical energy.
• D) In both cases the decrease in mechanical energy was the same.

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