Our high school student now has a question about potential energy due to gravity. she says, "i don't get the formula pe = mgh. it seems i can change the amount of potential energy something has just by changing my h = 0 point. say i'm holding a 3kg book over my head (two meters above my feet), but also say i'm on top of a 50 meter building. what's the potential energy of the book? is it mg2 (measuring from my feet) or is it mg52 (measuring from the ground)? "

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

we need answer choices

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement