An object is dropped on earth from a height of 15 m. how long did it take for the object to reach the ground? a) 1.2 seconds b) 1.5 seconds c) 1.8 seconds d)3.0 seconds

x=gt^2/2=>t^2=2x/g=30/9.81=3.05=>t=sqrt(3.05)=1.8 s

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

are you like autistic or something?

xd