Physics Help Forum Velocity and Displacement

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Sep 28th 2009, 10:58 PM #1 Junior Member   Join Date: Sep 2009 Posts: 23 Velocity and Displacement A particle's initial velocity is given by v0x = -1.0m/s and v0y = 3.0m/s; it's acceleration is ax = 0.50m/s2 and ay = -0.90m/s2. (a) Calculate its velocity 2.0s later. (b) Calculate its displacement at that time. vx = v0x + axt ∆x = v0xt + 1/2axt2 ∆y = v0yt + 1/2ayt2 v = -1.0m/s(x hat) + 3.0m/s(y hat) a = 0.5m/s2(x hat) - 0.9m/s2(y hat) Solve for velocity at 2.0s vx = v0x + axt vx = (-1m/s) + (0.5m/s2)(2.0s) vx = 0m/s vy = v0y + ayt vx = (3m/s) + (-0.9m/s2)(2.0s) vx = 1.2m/s v = 0m/s(x hat) + 1.2m/s(y hat) Calculate displacement. ∆x = v0xt + 1/2axt2 ∆x = (-1m/s)(2.0s) + 1/2(0.5m/s2)(2.0s)2 ∆x = -1m ∆y = v0xt + 1/2axt2 ∆y = (3m/s)(2.0s) + 1/2(-0.9m/s2)(2.0s)2 ∆y = 4.2m y = -1.0m(x hat) + 4.2m(y hat)
 Sep 29th 2009, 02:04 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Looks OK to me.

 Tags displacement, velocity