A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive x-axis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive y-axis. Both balls then start moving together. What is the magnitude of the resultant momentum before collision?
A.
1.3 kilogram meters/second
B.
1.5 kilogram meters/second
C.
1.8 kilogram meters/second
D.
2.1 kilogram meters/second

Question

A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive x-axis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive y-axis. Both balls then start moving together. What is the magnitude of the resultant momentum before collision?
A. 
1.3 kilogram meters/second
B. 
1.5 kilogram meters/second
C. 
1.8 kilogram meters/second
D. 
2.1 kilogram meters/second

dude · Answer

First calculate the momentum of each ball given the mass and speed
m = mass
v = velocity 
$P = m\cdot v$

Narad · Answer

The collision is inelastic as the particles move together after the collision, there is conservation of momentum in the x-direction and in the y-direction. Then, you can calculate the resultant momentum.