Two objects crash into each other. One had a mass of 15 kg and a velocity of -12 m/s. The other had a mass of 5 kg and a velocity of 42 m/s What is the momentum of the system?​

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

answer: 31, 5556. 952 seconds