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Maths-

General

Easy

Question

A helicopter, initially hovering 40 feet above the ground, begins to gain altitude at a rate of 21 feet per second. Which of the following functions represents the helicopter's altitude above the ground y , in feet, t seconds after the helicopter begins to gain altitude?

y = 40 + 21
y = 40 + 21t
y = 40 - 21t
y = 40t + 21

hint Hint:

Hint:

Here, first find the height height travel in second, and then make general equation.

The correct answer is: y = 40 + 21t

Explanation:

We have given a helicopter initially hovering feet above the ground, then it begins to gain altitude at rate of feet per second.

We have to find the function, which represents the helicopter’s altitude above the ground .

We will first find the height travel in second. And then find the total height.

Step 1 of 2:
We have given in one second the helicopter gain 21 feet.
So, the height travel in second will be 21t feet.
So, The total height in second will be 21t + 40.
Therefore the general function will be
y = 40 + 21t
Hence, Option B is correct.

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