In the following, K= kinetic energy, U= potential energy, and W=work. In using t

Question

In the following, K= kinetic energy, U= potential energy, and W=work. In using the expression K2+U2 = K1+U1+ W(other). We recognize that
A) K and U can be either positive or negative, depending on thereference point chosen.
B) gravitational and elastic potential energies would be includedin U1 and U2.
C) we are assuming no friction is present
D) W(other) is always positive
E) gravitational and elastic potential energies would be includedin W(other)
A) K and U can be either positive or negative, depending on thereference point chosen.
B) gravitational and elastic potential energies would be includedin U1 and U2.
C) we are assuming no friction is present
D) W(other) is always positive
E) gravitational and elastic potential energies would be includedin W(other)

Explanation / Answer

a) not correct, K is always positive since it is0.5m*v^2 b) yes c) not correct d) not correct , it can be negative e) not correct

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