Inclination of the plane .

By the principle of conservation of energy, the final kinetic energy is equal to the initial potential energy. The gravitational potential energy is given by $U = mgh$ , where $m$ is the object's mass, $g$ is the gravitational acceleration, and $h$ is the height of the object above the ground. Thus, we have $100 = 1 \cdot 10 \cdot h$ , which gives $h = 10$ meters. Now let $\theta$ be the inclination of the plane. By the Law of Sines, $\frac{\sin(90)}{20} = \frac{\sin \theta}{10}$ . Therefore, $\theta = \boxed{30}$ degrees.

1/2mv^2=100 so v^2=200 but v^2=2as bcoz u=0, thus a=5m/s^2 but in sliding motion a=gain(angle of inclination)