Question

Your neighbor's pesky kid insists on shooting 25.0 g rocks at your new 2.25kg light fixture hanging by a 26.0 cm wire from the ceiling of your porch. A) If each rock strikes the fixture traveling at 10.0m/s horizontally and rebounds at 2.00 m/s backwards, how high above the lowest point does the impact make your light fixture swing?

Answer 1

​​​​​​First we have to find out velocity of rock after collision, so by applying momentum conservation, this velocity is find out.

After this, by applying energy conservation max height can be easily find out.

So, height comes out to be 0.09cm.