What is the height from which a piece of ice should be dropped so that it completely melts on hitting the ground ?

What is the melting point of ice in Kelvin scale ?

A body is dropped from a height of 100m. At what height the velocity of the body will be equal to one half of the velocity when it hits the ground ?

At what height from the Earth's surface above the equator should a satellite be placed so that it can be geostationary ?

Find the percentage by which the moon should move faster, so that it escapes from gravitational field of the earth.

A figher plane flying horizontal at an altitude of 1.5 km with a speed of 720 km/h passed directly overhead an anti-aircraft gun. At what angle from the vertical shoud the gum be fired for the shell with muzzle velocity of 600 m/s to hit the plane ? At what minimum altitude should the pilot fly to avoid being hit ? g= 9.8 m/ s^2