When an object is in free fall we disregard the effect that air resistance would have in slowing down the object. So if a 10 kg object is in free fall and allowed to fall for 20 s what will be the final velocity at the end of this time? Remember: Vf=vi+at and if unless specified vi=0m/s and a=9.81m/s^2

where are the vectors ?

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.