Posted by
**Belle** on
.

A student of mas 70kg wants to walk beyond the edge of a cliff on a heavy beam of mass 300kg and length 10m. The beam is not attached to the cliff in any way, it simply lays on the horizontal surface of the cliff top, with one end sticking out beyond the cliff's edge. The student wants to position the beam so it sticks out as far as possible beyond the edge, but he also wants to make sure he can walk to the beam's end without falling down. How far from the edge of the ledge can the beam extend? Thank you for your help!

let x be the distance from the end to the cliff.

x*70g=massbeam(5-x)

check that. The five minus x is the length from the center of beam mass to the edge of cliff.

thank youu!