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posted by  elegant on 11/6/2009 5:28:25 PM  |  status: Closed  |  Earned Karma: 25

14.2 w9

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14.2 Your projectile launching system is partially jammed. It can only launch objects with an initial vertical velocity of 42.0 m/s, though the horizontal component of the velocity can vary. You need your projectile to land 211 m from its launch point. What horizontal velocity do you need to program into the system? show your work

m/s
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(Calvin)
posted by eab35 on 11/6/2009 5:44:40 PM  |  status: Live
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Response Details:
Find the time it will be in the air using the given vertical velocity.
0 = 42.0 * t + (1/2)(-9.81)t2
t = 8.57 seconds
Now calculate the horizontal component using that time and the given distance.
211 = vx(8.57)
vx = 24.6 m/s
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