A box of winter jackets of mass 109 kg is droped from a stationary helicopter at an altitude of 135 m. It lands the ground with a speed
of 10.0 m/s. During its fall, how much work
in Joule is done on
the box by air resistance (write magnitude only)?​

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?