Question

In a very busy off-campus eatery one chef sends a 241-g broccoli-tomato-pickle-onion-mushroom pizza sliding down the counter from left to right at 1.53 m/s. Almost simultaneously, the other chef launches a 321-g veggieburger-on-a-bun (with everything, but hold the horseradish) along the same counter from right to left at 2.49 m/s. The two delicacies collide head on at the given speeds–the counter is practically friction-free due to accumulated grease–and merge into a single, unbelievably savory serving. At what speed does the delectable dish move?

Answer 1

Momentum = m1V1-m2V2.
Momentum = 0.241*1.53 - 0.321*2.49=-0.43
= 0.43 to the Left.

m*V = 0.43.
(0.241+0.321)V = 0.43
0.562V = 0.43
V = 0.765 m/s.