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Author Topic: Physics projectile  (Read 10960 times)
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on: November 24, 2008, 06:03:44 am »

A projectile is launched straight up at 141 m/s. How fast is it moving at the top of the trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory?
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Reply #1 on: November 24, 2008, 08:32:45 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

goto http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=745.msg2801#msg2801

use the applet embedded or
the jar file http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=745.0;attach=372

u = 141 m/s
alpha = 45 degree

select from menu to visualize the quality
ux =
vx =

click play

what do you notice about the vx (instantaneous velocity in x direction ) ?

hint: vx = 100 m/s
extra fact: notice vx = 100 m/s = ux (initial velocity in x direction) because it is a motion in x direction without any acceleration ( ax )  so it is unchanged Smiley
« Last Edit: November 24, 2008, 08:36:04 am by lookang » Logged
Fu-Kwun Hwang
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Reply #2 on: November 24, 2008, 07:41:43 pm »

If air resistance is not considered in projectile motion. The only external force is gravitation force.
So projectile only accelerate in the vertical direction and the horizontal velocity is constant.
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