Which of these are true for Light? (pick 3)

• Light has to travel through a medium
• Light can travel in a vacuum (without a medium)
• Light can travel in a straight line, until it hits something
• Light can move in curvy directions without hitting something
• Light is a form of energy

Please help :)

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.