Imagine this in the dark... How do you explain if someone is bouncing a glowing basketball and it can appear the ball is moving away (to the left or right) in one situation and just bouncing it up and down in another situation. I think this has to do with field of reference but I'm honestly very confused. This is basically the question "Discuss how the observer’s movement, the basketball player’s movement, and the observer’s position relative to the basketball player affect the observer’s perception of the ball’s motion"

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s