An ostrich runs north in a straight line for 21 meters. she then turns around and runs 25 meters back toward her nest (south) on the same path. what is her displacement?

How can you write e method for the experiment of separating sand from water by filtration process? 1-materials 2-steps 3-conclusion also the same for the separating process of water and salt by filtration or distillation. quick because i need to finish my hw