Question

A 1,200 kg car is traveling at 140 km/h south. It strikes a 950 kg car traveling 75 km/h north. Ignoring any outside forces, what is the momentum of the system after the collision?
@jabez

Answer 1

140 km/h = 38.89 m/s
75 km/h = 20.83 m/s

Assuming positive direction is north
P_final = P_initial = (1200 kg)(-38.89 m/s) + (950 kg)(20.83 m/s)

Answer 2

these are my options

Answer 3

@peachpi

Answer 4

ok so it looks like you don't have to convert.
Multiply the mass and velocity of each vehicle to find the momentum, then add them

P = 1200(-140) + 950(75)

Answer 5

ok i got b then

Answer 6

looks like another conservation of linear momentum q. total momentum before coll is equal to that after coll. from the posts it looks like others have a grip on the algebra/arithmetic ...

Answer 7

would b be right @peachpi

Answer 8

yes

Answer 9

ok thank you