jump on sprite touch using box2d - c++

Question

I am new cocos2dx developer.I am using cocos2dx v3.7.1. now i want to jump sprite on touch the sprite.I refer many answer but i am confused.
i implement below code in HelloWorld.cpp file
Scene* HelloWorld::createScene()
{
auto scene = Scene::createWithPhysics();
scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);
//scene->getPhysicsWorld()->setGravity(Vec2(0,0.0));
auto layer = HelloWorld::create();
layer->SetPhysicsWorld( scene->getPhysicsWorld() );
scene->addChild(layer);
return scene;
}
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !Layer::init() )
{
return false;
}
auto dispatcher = Director::getInstance()->getEventDispatcher();
auto touchListener = EventListenerTouchOneByOne::create();
touchListener->setSwallowTouches(true);
touchListener->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan, this);
touchListener->onTouchEnded = CC_CALLBACK_2(HelloWorld::onTouchEnded, this);
touchListener->onTouchMoved = CC_CALLBACK_2(HelloWorld::onTouchMoved, this);
dispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
sprite3 = Sprite::create("kartoon.png");
sprite3->setPosition(Point(40,40));
sprite3->setAnchorPoint(Vec2(0,0)); spritibody=PhysicsBody::createBox(sprite3->getContentSize(),PhysicsMaterial(0,1,0));
sprite3->setPhysicsBody( spritibody );
spritibody->setDynamic(true);
this->addChild(sprite3,4);
this->schedule(SEL_SCHEDULE(&HelloWorld::chek),0.01f);
return true;
}
void HelloWorld::chek()
{
if (sprite3->getPosition().y>109) {
yvel-=0.1;
}
else{
if(yvel!=6)
{
xvel=0;
yvel=0;
}
}
sprite3->setPosition(Vec2(sprite3->getPosition().x+xvel,sprite3->getPosition().y+yvel));
}
bool HelloWorld::onTouchBegan(Touch* touch, Event* event)
{
CCLOG("onTouchBegan x = %f, y = %f", touch->getLocation().x, touch->getLocation().y);
auto target = static_cast<Sprite*>(event->getCurrentTarget());
Point locationInNode = target->convertToNodeSpace(touch->getLocation());
if(sprite3->boundingBox().containsPoint(locationInNode))
{
// spritibody->setVelocity(Vec2(2, 0));
spritibody->applyImpulse(Vec2(0,40));
sprite3->setPhysicsBody(spritibody);
spritibody->setGravityEnable(true);
}
return true;
}
In this when i tap on sprite, its jump continous and after some type sprite3 go out off screen.But i want to only jump one time when i tap on sprite3.
plese help me.