MovingAndJumping

using UnityEngine;
using System.Collections;

public class PlayerMovement : MonoBehaviour {

    public float speed = 5f;
    public float jumpPower = 8f;

    public LayerMask groundMask;
    public Transform groundCheck;
    float groundedRadius = .2f;

    bool grounded;



    void Update()
    {
        grounded = Physics2D.OverlapCircle(groundCheck.position, groundedRadius, groundMask);

        float x = Input.GetAxis ("Horizontal");
        rigidbody2D.velocity = new Vector2 (speed * x, rigidbody2D.velocity.y);

        if(Input.GetButtonDown("Jump") && grounded)
        {
            rigidbody2D.AddForce(new Vector2(0f,jumpPower), ForceMode2D.Impulse);
        }
    }
}