Gravity script unity

// Keep in mind that this solution is for custom physics.
// The easy way to add gravity is to just slap a RigidBody component 
// on your objects.

using UnityEngine;

public class MyObject : MonoBehaviour
{
	public Vector3 speed;
	public float gravity = 9.8f;

	// Start() is called before the first frame
	void Start()
    {
    	speed = new Vector3(0f, 0f, 0f);
    }

	// FixedUpdate() is called at regular time intervals independent of frames
	void FixedUpdate()
	{
    	speed.Set(speed.x, speed.y - gravity * Time.fixedDeltaTime, speed.z);
        transform.position += speed;
	}
}

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