Posted by Jeremiah on Wednesday, January 16, 2013 at 2:01pm.
A ladder 20m long rest against a vertical wall so that the foot of the ladder is 9m long. Find correct to the nearest degree the angle that the ladder makes with the wall.

Physics  Elena, Wednesday, January 16, 2013 at 4:01pm
sinα =9/20 =0.45
α=sin⁻¹0.45 =26.7⁰