A ball rolls in a horizontal direction off of a ledge. If the velocity of the ball was 11 m/s and the ball traveled 46 m from the base of the ledge, how tall is the ledge? Explain please

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

Are good conductors of heat also good conductors of electricity? explain your answer.