Falling slow when moving in air

Questions & Answers
1

when i jump and move in air its falling very slow and its annoying and i cant fix it please help.

my code is here:

public Rigidbody2D rb2D;

public float playerSpeed;
public float maxSpeedForPlayer;
public float jumpForce = 2f;
public Vector3 jump;
public bool isGrounded;
private void Start()
{
    rb2D = GetComponent<Rigidbody2D>();
    jump = new Vector2(0f, 2f);
}
//Jumping

private void OnCollisionStay2D()
{
    isGrounded = true;
}

private void OnCollisionExit2D()
{
    isGrounded = false;
}

//Input and movement
private void Update()
{
    if (Input.GetKey(KeyCode.D))
    {
        rb2D.velocity = new Vector3(maxSpeedForPlayer, 0, 0);
        rb2D.AddForce(new Vector3(playerSpeed, 0f, 0f));
    }
    if (Input.GetKey(KeyCode.A))
    {
        rb2D.velocity = new Vector3(maxSpeedForPlayer, 0, 0);
        rb2D.AddForce(new Vector3(-playerSpeed, 0f, 0f));
    }
    if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
    {
        rb2D.AddForce(jump * jumpForce, ForceMode2D.Impulse);
        isGrounded = false;
    }
}

}

2

You can change Gravity value may be better and fix this problem

Here : Unity - Manual: Physics

3

You can block, movement when falling. Try this.

if (Input.GetKey(KeyCode.D) & isGrounded)
     {
         rb2D.velocity = new Vector3(maxSpeedForPlayer, 0, 0);
         rb2D.AddForce(new Vector3(playerSpeed, 0f, 0f));
     }
     if (Input.GetKey(KeyCode.A) & isGrounded)
     {
         rb2D.velocity = new Vector3(maxSpeedForPlayer, 0, 0);
         rb2D.AddForce(new Vector3(-playerSpeed, 0f, 0f));
     }
     if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
     {
         rb2D.AddForce(jump * jumpForce, ForceMode2D.Impulse);
         isGrounded = false;
     }
4

You’re setting your Y velocity to 0.

         rb2D.velocity = new Vector3(maxSpeedForPlayer, 0, 0);

should be

         rb2D.velocity = new Vector3(maxSpeedForPlayer, rb2d.velocity.y, 0);