A weight is attached to a spring and reaches its equilibrium position (x = 0). It is then set in motion resulting in a displacement of x = 10 cos t, where x is measured in centimeters and t is measured in seconds. See the accompanying figure.

a. Find the spring’s displacement when t = 0, t = π/3, and t = 3π/4.

b. Find the spring’s velocity when t = 0, t = π/3, and t = 3π/4.

www. X - 10 -0 10 Equilibrium position at x = 0