A body of mass 50kg is placed on a wall of height 1.5m what is the potential energy

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Idon’t quite understand this problem

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above