at a particular instant a hot air ballon is 100 m in the air and descending at a constant speed of 2,0 m/s. at this exact instant a girl throws a ball horizontally relative herself with an initial speed of 20,0 m/s when she lands where will she find the ball ?

Anybody wanna ? (picture included? )

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

Aforce is a vector quantity because it has both?