4. Two metal balls are the same size but ball A weighs 20 N and ball B weighs 10 N. Ball B is dropped one second before ball A from the roof of a 100 m tall building to the sidewalk below. If the effects of air can be ignored, then at what point will ball A catch up to ball B. (The distance listed, below, are from the top of the building.) (a) 10 m (f) 70 m (b) 20 m (g) 100 m (c) 30 m (h) ball A never catches up to ball B (d) 40 m (i) not enough information given. What is missing? (e) 50 m 5. An object has an acceleration, a , = zero, 0 . What else must be true (a) the change in velocity is zero (e) the position is zero (b) the displacement is constant ( f ) the total force on the object is zero (c) the object is not moving (g) the velocity is constant (d) the position is constant (h) the velocity is zero (i) not enough information given. Information Missing