private $g;
private $r;
private $v0;
function HandleB($g, $r)
{
$this->g = $g;
$this->r = $r;
$this->v0 = sqrt(5 * $this->g * $this->r);
}
function __destruct()
{
echo "2：结果是:" . $this->v0 . "<br>";
}
}
$resultB = new Balance();
$resultB->HandleB(10, 1);
/**
一倾斜角为30°的斜面，动摩擦因数u = 0.5; h = 5m;g = 10N/kg;求物体下落到底的速度
*/
class energy
{
private $g;
private $h;
private $u = 0.5;
private $v;
function HandleC($h, $g)
{
$this->g = $g;
$this->h = $h;
$this->v = sqrt(2 * $this->g * $this->h - $this->u * $this->g * $this->h * 3 / 2);
}
