A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. The engines then fire, and the rocket accelerates upward at 3.90 m/s² until it reaches an altitude of 1170 m. At that point its engines fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s². (You will need to consider the motion while the engine is operating and the free-fall motion separately.) (a) For what time interval is the rocket in motion above the ground? X S (b) What is its maximum altitude? X km (c) What is its velocity just before it hits the ground? X m/s

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter6: Motion In Two Dimensions
Section6.3: Relative Velocity
Problem 27PP
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A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. The
engines then fire, and the rocket accelerates upward at 3.90 m/s² until it reaches an altitude of 1170 m. At that point its engines
fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s². (You will need to consider the motion while the engine
is operating and the free-fall motion separately.)
(a) For what time interval is the rocket in motion above the ground?
X S
(b) What is its maximum altitude?
X km
(c) What is its velocity just before it hits the ground?
X m/s
Transcribed Image Text:A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. The engines then fire, and the rocket accelerates upward at 3.90 m/s² until it reaches an altitude of 1170 m. At that point its engines fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s². (You will need to consider the motion while the engine is operating and the free-fall motion separately.) (a) For what time interval is the rocket in motion above the ground? X S (b) What is its maximum altitude? X km (c) What is its velocity just before it hits the ground? X m/s
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