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1.3.6 The modulus function (A-level only)

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Question 22

The altitude of a specialized drone AAA, in meters, relative to a reference platform is modeled by the function A(t)=1.5∣t−6∣−12A(t) = 1.5|t - 6| - 12A(t)=1.5∣t−6∣−12, where t∈Rt \in \mathbb{R}t∈R represents the time in seconds since a tracking sensor was activated.

a.

State the coordinates of the vertex P P\,P of the graph of y=A(t)y = A(t)y=A(t).

[1]
b.

Calculate the value of the composite function AA(2)AA(2)AA(2).

[2]
c.

Determine the set of values of t t\,t for which 1.5∣t−6∣−12<2t−31.5|t - 6| - 12 < 2t - 31.5∣t−6∣−12<2t−3.

[3]
d.

Solve the equation A(∣t∣)=0A(|t|) = 0A(∣t∣)=0.

[3]

1.3.6 The modulus function (A-level only) Questions

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