Random Quiz 51

course PHY 121

A ball starting from rest rolls 11 cm down an incline on which its acceleration is 27 cm/s2, then onto a second incline 44 cm long on which its acceleration is 9 cm/s2. How much time does it spend on each incline?

11 * 27 = 297s

44 * 9 = 396 s

297 + 396 = 693s

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The units of your first and second calculations would be cm^2 * sec^2.

The units of your second would therefore be cm^2/sec^2 + cm^2 / sec^2, and this would be the unit of our result.

You need to list the quantities v0, vf, `dt, a and `ds , and identify which ones you know for this interval.

Please do your best to identify these quantities, and submit a revision explaining your thinking. Even if your thinking isn't completely right, that will give us a basis from which to proceed.

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