Concept explainers
(a)
The maximum altitude of the rocket.

Answer to Problem 82QAP
The maximum altitude of the rocket is 1091.7 m
Explanation of Solution
Given:
a1 = 2.00 m/s2
a2 = 3.00 m/s2
t1 = 15 sec
t2 = 12 sec
Formula used:
H=ut+12at2
S = distance travelled
u = initial velocity
a = acceleration
t = time taken
Calculation:
During first stage, the height reached is,
H1=ut1+12a1t12=0×4+12×2×162=256 m
At the end of first stage speed is,
v1=u+a1t1=0+2×16=32 m/s
During second stage, the height reached is,
H2=v1t2+12a2t22=32×12+12×3×122=600 m
At the end of second stage speed is,
v2=v1+a2t2=32+3×12=68 m/s
At the end of second stage, the rocket will be under the effect of gravity, so it will continue to move upwards up to a point where its kinetic energy will be zero.
The time duration for reaching the maximum altitude from the end of second stage is,
v3=v2−gt30=68−(9.8×t3)t3=689.8=6.938 sec
The distance between the end of second stage and maximum altitude is,
H3=v2t3−12gt32=68×6.938−12×9.81×(6.938)2=235.7 m
So, the maximum height is,
H1=H1+H2+H3=256+600+235.7=1091.7 m
(b)
The average speed and average velocity when the rocket fall back to launch pad.

Answer to Problem 82QAP
The average speed is 44.69 m/s and average velocity is 0.
Explanation of Solution
Given:
The maximum altitude is 1091.67 m
Calculation:
Once rocket reaches the maximum height, it will start to fall and reach the launch pad on Earth surface.
The time duration taken by rocket to fall back is,
H=v3t4+12×g×t421091.7 m=0×t4+12×9.81×t42t4=14.91 sec
Total time duration of flight,
t=t1+t2+t3+t4=15+12+6.938+14.91=48.85 sec
Total distance travelled is,
Ht=H+H=2H=2×1091.7 m=2183.4 m
So average speed will be,
S=2183.3448.85=44.69 m/s
Since, the initial and final position of rocket is same, so the net displacement is zero. Therefore, the average velocity will be,
v=Dit=0t=0 m/s
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Chapter 2 Solutions
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