Which one of the following statements is true for the speed 'v' and the acceleration 'a' of a particle executing simple harmonic motion
1
When 'v' is maximum, 'a' is maximum
2
Value of 'a' is zero, whatever may be the value of 'v'
3
When 'v' is zero, 'a' is zero
4
When 'v' is maximum, 'a' is zero