A 420-kg object on a frictionless horizontal surface is

Question

A 4.20-kg object on a frictionless horizontal surface is attached to one end of a horizontal spring that has a force constant k = 640 N/m. The spring is stretched 7.20 cm from equilibrium and released.

1) What is the frequency of the motion?

..... Hz 

2) What is the period of the motion?

..... s 

3) What is the amplitude of the motion?

...... cm 

4) What is the maximum speed of the motion?

...... m/s 

5) What is the maximum acceleration of the motion?

...... m/s2

6) When does the object first reach its equilibrium position?

........ s 

7) What is its acceleration at this time?

....... m/s²