Physics Help Forum [SOLVED] Max value of Y-coordinate

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 31st 2009, 12:14 PM #1 Junior Member   Join Date: Jan 2009 Posts: 3 [SOLVED] Max value of Y-coordinate I am so new to physics, and it's just so confusing to figure out which numbers go in what equation and such. Here's a problem I'm struggling with: A cart is propelled over an xy plane with acceleration components ax = 6.6 m/s2 and ay = -1.6 m/s2. Its initial velocity has components v0x = 7.4 m/s and v0y = 11.0 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest y coordinate? EDIT: I solved that problem, but here's another one: A certain airplane has a speed of 80.25m/s and is diving at an angle of θ = 27.0° below the horizontal when the pilot releases a radar decoy (Fig. 4-37). The horizontal distance between the release point and the point where the decoy strikes the ground is d = 747 m. (a) How long is the decoy in the air? (b) How high was the release point? Last edited by craig22; Jan 31st 2009 at 04:07 PM.
 Feb 1st 2009, 11:25 AM #2 Senior Member   Join Date: Dec 2008 Location: Las Cruces NM Posts: 256 The general equation for the position of a body under constant acceleration has certain constants. These are the acceleration, the initial position and the initial velocity. Did you try writing the equations for the x coordinate of the decoy position and the y coordinate of the decoy position? Defining t = 0 to be the time of release and t1 = the unknown time of impact, you can write some equations for the situation at those times. These equations will involve the unknown quantities. Your question doesn't make it clear whether you have trouble with the physics (writing the equations) or the math of solving simultaneous equations.
 Feb 4th 2009, 03:32 PM #3 Junior Member   Join Date: Jan 2009 Posts: 3 I've already solved the problem. Thanks anyway!

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