The $\mathrm{x}-\mathrm{t}$  graph of a particle undergoing simple harmonic motion is shown below. The acceleration of the particle at $\mathrm{t}=\frac{4}{3}\sec .$ is

When a sound wave of frequency $300\mathrm{Hz}$ passes through a medium, the maximum displacement of the medium is $0.1 \mathrm{cm}$. The maximum velocity of the particle is equal to.

The time period of an oscillating body executing SHM is $0.05 \mathrm{s}$ and its amplitude is $4 \mathrm{cm}$. The maximum velocity of particle is:

Two simple Harmonic Motions of angular frequency $100 \mathrm{and} 1000 \mathrm{rad}/\mathrm{s}$ have the same displacement amplitude. The ratio of their maximum accelerations is$:$