A car moving at a speed of 8 m/s enters a highway and accelerates at 3 m/s2. How fast will the car be moving after it has accelerated for 56 m?

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?