How Does Simple Harmonic Motion Affect Velocity and Energy in a Spring System?

[mattmannmf]

A 2.6 kg block is attached to a horizontal spring and undergoes simple harmonic motion on a frictionless surface according to the graph shown above.

(a) What is maximum velocity of the box?


(b) What is the mechanical energy of the box?

now the wave is -sin wave but crosses the x-axis at 4,8,12,16,20,24 and has an amplitude of 2 cm

 

[LowlyPion]

What are your thoughts on how to approach it?