First post =] Requesting guidance with this particular problem: 1. The problem statement, all variables and given/known data A 1.20 kg object is moving in the x direction at 14.4 m/s. Just 3.31 s later, it is moving at 28.8 m/s at 34.0 degrees to the x axis. a.) What is the magnitude of the force applied during this time? b.) What is the direction of the force applied during this time? 2. Relevant equations Fnet=ma? 3. The attempt at a solution I first organized all my givens, that is: mObject = 1.20kg vObject = 14.4m/s t = 3.31s v2Object = 28.8m/s 34 degrees to x axis I established a coordinate system so that positive would be ^ and -> , and negative would be the opposites. I then drew the corresponding vectors (14.4m/s and 28.8m/s at the angle). Then I broke down the angled vector into its x and y components: v2x = 28.8cos34 = 23.88m/s v2y = 28.8sin34 = 16.1m/s Here's where I get uncomfortable with my work: I know Fnet = ma So F = 1.2(v/t) = 1.2(v2-v1 / t) = 1.2kg((23.88m/s - 14.4m/s) / 3.31s) = 3.44 I'm aware I completely neglected the y component, and I've been having trouble finding out where to fit it really. I'd love a push in the right direction if someone wouldn't mind - thanks!