Flattening is a example of a physical change.
Hope this helps! :D
A) The stone moves along the vertical direction by unifom accelerated motion, with acceleration equal to g (gravitational acceleration), starting from initial position h above the ground and with initial velocity equal to zero. So, its vertical position follows the law:
b) The time the stone takes to reach the ground is the time t at which its vertical position y(t) becomes zero:
and if we solve it, we find
c) Since it is a uniform accelerated motion, the velocity of the stone at time t is given by
where the initial velocity is zero:
. The stone hits the ground at t=9.6 s, so its velocity at that time is
where the negative sign means it is directed downward.
d) In this case, since the initial velocity is not zero, the position at time t is given by
where
is the initial velocity.
The time the stone takes to reach the ground is the time t such that y(t)=0, so we have:
and by solving this equation, we find
law one: objects in motion tend to stay in motion <em>(unless acted on by an unbalanced force)</em>, and objects at rest tend to stay at rest.
law two: force equals mass times acceleration. <em>(f=m*a)</em>
law three: for every action there is an equal an opposite reaction.
It is not a solid nor a liquid so it would half to be gas