from turtle import *




def perim():
	up()
	goto(-300,-150)
	down()
	forward(600)
	left(90)
	forward(300)
	left(90)
	forward(600)
	left(90)
	forward(300)
	left(90)
	up()
	goto(0,0)
	down()
	left(90)
	
def vai(vx,vy):
	up()
	goto(0,0)
	down()
	x = 0
	y = 0
	dt = 0.004
	t = 0
	while t<100:
		vy=vy-9.8*dt
                x=x+vx*dt
		y=y+vy*dt
		goto(x,y)
		if y<-150:
		   y=-149
		   vy=-vy*0.95 
                if y>150:
		   y=149 
		   vy=-vy*0.95 
                if x<-300: 
		   x=-299 
		   vx=-vx*0.95 
                if x>300:  
		   x=299 
		   vx=-vx*0.95
		t = t+dt