user: I've been conducting experiments on projectile motion and recorded data from my latest trials using a catapult to launch three objects. For a stone with an initial velocity of 20 m/s, a rubber ball at 30 m/s, and a metal ball at 25 m/s, each experiencing an acceleration of -9.8 m/s² and in motion for 5 seconds, could you work out the displacement for each object after those 5 seconds?

Available functions:
name: calculate_displacement
description: Calculates the displacement of an object.
parameters: type: dict
properties: initial_velocity: type: float
description: The initial velocity of the object, in meters per second.
acceleration: type: float
description: The acceleration of the object, in meters per second squared.
time: type: float
description: The time the object has been moving, in seconds.
required: initial_velocity
acceleration
time