Impulse and Momentum of two cars

[patymae]

Homework Statement

Two identical cars (m = 1350 kg) are traveling at the same speed of 25.0 m/s. They are moving in the directions shown in the drawing. What is the magnitude of the total momentum of the two cars?
img:http://higheredbcs.wiley.com/legacy...ics/sat_c07/sat_c07_q1_03/sat_c07_q1_03_1.gif


A particle is moving along the +x axis, and the graph shows its momentum p as a function of time t. What is the magnitude of the net average force in regions A . Give your answer to two significant figures, e.g., 6.3 or 0.72.
img: http://higheredbcs.wiley.com/legacy...ics/sat_c07/sat_c07_q1_08/sat_c07_q1_08_1.gif

Homework Equations

i don't know I'm confused.

The Attempt at a Solution

please help me.thank you very much!

 

[rock.freak667]

For the first one, try splitting the momenta into x and y components and then finding the resultant x and y momenta

 

[patymae]

how can i split the momentum?hoho confused

 

[Borek]

Momentum is a vector.