Two billiard balls, each with a mass of 0.17 kg, collide with each other on a pool table. Before the collision, one ball is moving north at 2.8 m/s and the
other ball is moving south at 1.6 m/s. What is the momentum of thissystem
after the collision?
A. 0.74 kg:m/s north
B. 0.20 kg-m/s north
C. 0.20 kg-m/s south
D. 0.74 kg. m/s south

think about it deeply and passionately about this property

i am sorry

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

rotation point l

step-by-step explanation: