What does the presence of petroleum deposits tell you about what kind of landform was located there in the past (how did it form)?

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i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

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.