Question

A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?

          A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?
        
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?
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Transcript

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00:01 Hello, here a rocket was launched with acceleration of 20 meters per square second and after 4 seconds t1 motor turned off.
00:10 We have to determine maximum height.
00:14 Let's do this.
00:15 So first let's determine speed which will be attained at the end of this acceleration.
00:27 That is 80 meters per second.
00:31 Now let's determine the height which will be attained.
00:34 That is at1 squared over 2 because it started from rest.
00:43 Now let's determine the time which is needed to come to the stoppage t2...
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