There is a ball hanging on a spring which moves up and down. We assume that the maximum distance for the ball move up and down from the equilibrium position is 5 inches.
Suppose the time for the ball move from the equilibrium position to the maximum positive, then to the maximum negative position, then back to the equilibrium position is 0.6 seconds.
The ball will repeat the process. Assume that the spring has perfect elasticity and no friction or air resistance. Now we push the ball to the top position. When t = 0 we release the ball from the top position,
then where is the ball when t = 1 second?