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Download WorksheetThe potential energy of a system is U(x)=4x^2. The force at x=3 is:
12N
2.-12N
3.24N
4.-24N
A body of mass mmm moving with velocity vvv collides elastically with another identical body at rest. After collision, the first body comes to rest. The KE of system after collision is:
0
2.1/4mv$\frac{mv^2}{4}$
3.1/2mv$\frac{mv^2}{4}$
4.$mv^2$
Energy can
be created but can not be destroyed
2.not be created but can be destroyed
3.neither be created nor be destroyed
4.be created can be destroyed
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