how does the intencity of a sound wave change if the distance from the source is increased by a factor of 3

the answer is a. at the equator

1/0.14nm = 10^10/1.4 a lot

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.