a ride in amusement park imagica consists of rotating circular platform of 6m in diameter ,from whichheavy seatsare suspended at end of light chains {the length of the chain =3cm}.when the system rotates ,the chain makes an angleof 37 degree with vertical .find the speed of kid sitting on it

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative