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Old 02-08-2010, 02:38 PM
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Default Projectile Motion

I am lost as to how to solve this problem, i have tried using cos(62.5) to find horizontal and sin(62.5) to find altitude, both where wrong, and for part A i have no idea what to do, please help

A rocket is launched from rest and moves in a straight line at 62.5 ° above the horizontal with an acceleration of 55.0 m/s2. After 23.0 s of powered flight, the engines shut off and the rocket follows a parabolic path back to earth. Find the time of flight from launch to impact.

_____


What is the maximum altitude reached?

_____

What is the horizontal distance between the launch pad and the impact point?

_____
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  #2  
Old 02-08-2010, 07:46 PM
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Hi juggalomike
Quote:
Originally Posted by juggalomike View Post
A rocket is launched from rest and moves in a straight line at 62.5 ° above the horizontal with an acceleration of 55.0 m/s2. After 23.0 s of powered flight, the engines shut off and the rocket follows a parabolic path back to earth.
Quote:
What is the maximum altitude reached?
find the distance traveled when the power is on using kinematics, then use trigonometry to find the altitude

Quote:
Find the time of flight from launch to impact.
So, the time of flight from launch to impact = 23 seconds + t
When the engines shut off, the velocity in y-direction = 0. Find t.


Quote:
What is the horizontal distance between the launch pad and the impact point?
total horizontal distance = horizontal distance when power is on + horizontal distance of parabolic motion
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Old 02-08-2010, 10:16 PM
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Quote:
Originally Posted by songoku View Post
Hi juggalomike



find the distance traveled when the power is on using kinematics, then use trigonometry to find the altitude
So does that meen when the power shuts off thats the max altitude? i as under the impression that due to the acceleration from the thrusters it would continue to rise until gravity reduced the velocity to 0
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Old 02-09-2010, 01:39 PM
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nvm, figured it out thanks
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