Amarble is thrown horizontally with a speed of 15 m/sec from the top of a building. when it strikes the ground, the marble has a velocity that makes an angle of 65⁰ with the horizontal. from what height above the ground was the marble thrown?

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?