Answer:
A. 4.47 m/s
Explanation:
As the ball oscillates, it mechanical energy, aka the total kinetic and elastics energy stays the same. For the ball to be at maximum speed, its elastic energy i 0 and vice versa. When the ball is at rest, its kinetic energy is 0 and its elastic energy is at maximum at 50 cm, or 0.5 m
1500 g = 1.5 kg
[tex]E_e = E_k[/tex]
[tex]kx^2/2 = mv^2/2[/tex]
[tex]120*0.5^2/2 = 1.5*v^2/2[/tex]
[tex]15 = 0.75v^2[/tex]
[tex]v^2 = 15 / 0.75 = 20[/tex]
[tex]v = \sqrt{20} = 4.47 m/s[/tex]
