An object is attached to the end of a vertical spring and causes it to stretch by 20 cm. The object is then pulled down an additional 10 cm and released. The maximum speed of the oscillating object is equal to:

a. 0.57 m/s

b. 0.70 m/s

c. 0.20 m/s

d. 2.0 m/s

e. 2.1 m/s

A pendulum that completes 66 swings in one minute has an oscillation frequency of?

a. 1.1 s

b. 0.91 s

c. 1.1 s^-1

d. 0.9 s^-1

e. Cannot be determined from the information given