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2014-09-01T22:53:56+05:30

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 v = u + a t = 0 + 10 m/sec² * 0.5 sec
v = 5 m/sec
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average speed = (inital + final) /2 = (u+v)/2 = (0+5)/2 = 2.5 m/sec
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s = u t + 1/2 a t²
height of window = 0 t + 1/2 * 10 * 0.5² = 1.25 meters
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The force that is responsible for the change in position of the object is the Earth gravitation force of attraction or gravity.

2 5 2
Thanx! I wanna ask that, isn't that force- Unbalanced force????
one can call it unbalanced or resultant force or net force acting on object - in an isolated system of one object flying in air near surface and in earth's atmosphere. It is the resultant if u take into account air resistance also.
thanx a lot! :-)
thanx , u r welcom