New example

[arifinwandagau987-cyber]

using UnityEngine;

public class PlayerJump : MonoBehaviour
{
public float jumpForce = 7f;
private Rigidbody2D rb;

void Start() {
    rb = GetComponent<Rigidbody2D>();
}

void Update() {
    if (Input.GetKeyDown(KeyCode.Space)) {
        rb.velocity = Vector2.up * jumpForce;
    }
}