Question
Asked Jan 19, 2020
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Specifically a dynamics problem:

Two rockets start from rest at the same elevation. Rocket A accelerates vertically at 20 m/s2 for 12 s and then maintains a constant speed. Rocket B accelerates at 15 m/s2 until reaching a constant speed of 150 m/s.Construct the a-t, v-t, and s-t graphs for each rocket until t = 20 s. What is the distance between both rockets when t = 20 s?

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Expert Answer

Step 1

The equation for both the rockets is taken separately.

For rocket A:

The velocity of rocket is calculated using the relation,

Mechanical Engineering homework question answer, step 1, image 1
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Step 2

And, elevation of the rocket is calculated by using the equation of motion,

Mechanical Engineering homework question answer, step 2, image 1
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Step 3

When the time is between t =12 sec to t = 20 sec then, t ˃12.

Since the rocket accelerate at const...

Mechanical Engineering homework question answer, step 3, image 1
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