1) A ball is dropped from a height of 20m. Assuming that air resistance is negligible: i) How fast will it be travelling when it hits the ground?
ii) How long will it take to hit the ground?

Question 5 kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. she placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. which of the following best describes the purpose of the experiment? to relate the amount of time a box is exposed to sunlight to the warmth of air within the box to relate the type of box material to the mass of the box to relate the size of the box to the warmth of air within the box to relate the type of box material to the warmth of air within the box