self.vSpeed starts at zero.

        height = 200
        gravity = ((speed ** 2) / height) * 0.5
        # destruct?
        if self._selfDestruct > 0:
            self._selfDestruct -= 1
        elif self._selfDestruct == 0 and not self._dead:
            self.pop()
        # update horizontal movement
        self.x += self.hSpeed
        if self.x + self.rect.h > 800:
            self.x = 800 - self.rect.w
            self.dx = -abs(self.hSpeed)
        elif self.x < 0:
            self.x = 0
            self.move = abs(self.move)
        # fix vertical position
        self.y += self.vSpeed
        self.vSpeed += gravity
        if self.y + self.rect.h > 500:
            self.y = 500 - self.rect.h
            self.vSpeed = -speed
            self._turn = False
        # update rect
        self.rect.x = int(self.x)
        self.rect.y = int(self.y)
        if self.vSpeed >= 0 and not self._turn:
            self._turn = True
            print 500 - self.y - self.rect.h