6. If a falling object has little air resistance, the distance, d. it travels can be modelled with the
quadratic equation d = 4.9+. where d is in meters and is the time in seconds.
a)
How far does an object fall in the first 2 seconds?
[2 marks]
b)
How long will it take for an object to fall 100 meters?
[2 marks]

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.