An object falling in a vacuum is affected
only by the gravitational force. An
equation that can model a free-falling
object on Earth is d = -4.9t^2, where d is
the distance travelled, in metres, and t is
the time, in seconds. An object free falling
on the moon can be modelled by the
equation d = -1.6t2.
a) Sketch the graph of each function.
b) Compare each function equation to the
base function d = t^2.
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