Suppose a 4.0-kg projectile is launched vertically with a speed of 8.0 m/s . What is the maximum height the projectile reaches?

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.