Vocaloid one year ago simple momentum and force problem

1. Vocaloid

an object moves in the x direction with a momentum of 8 kg * m/s. a force with Fx = -9N and Fy = 3N acts on the object for 0.15 seconds. what is the magnitude of the velocity after the 0.15 seconds have passed? my thought is to use the momentum update principle (final momentum = initial momentum + Fnet*deltaT) but I'm not sure how to set things up

2. Abhisar

So mass of the object is not given?

3. Vocaloid

no

4. IrishBoy123

you need the mass to get velocity

5. Vocaloid

@IrishBoy123 made a typo, it wants the magnitude of the momentum after 0.15 seconds. would I still need the mass for that?

6. IrishBoy123

nope, you're now good to go! i would do something like $\vec p_o = <8,0>$ $\vec F = \frac{d \vec p}{dt} \implies \Delta \vec p = \vec F .\Delta t$ $\therefore \vec p = <8,0> + 0.15<-9,3>$ $|\vec p| = \sqrt{p_x^2 + p_y^2}$

7. Vocaloid

that's what I was thinking, too, I just had my numbers set up wrong I got the answer, thanks for your help ^_^