Please show all steps for understanding! Thanks in advance :)

Explain. Consider a person standing on a platform supported with springs in an elevator. gine leanbribe saisle antero dear ivelys om for a. Define an inertial frame and explain its significant for the use of the principle of dynamics, E F = ma. b. The person is standing still on the platform, both not moving within the elevator. Then suddenly, the person and the platform squish down a little within the elevator and stay squished down. Describe the direction of the velocity and how the speed is changing for two possible motions of the elevator during this squish and explain how the squish of the platform results from the motion of the elevator. Bonus: Describe the velocity and acceleration of a third possible motion that would fit the description above