A car start from rest and accelerate uniformly to a velocity of 20m/s in 20s . This velocity is then maintained for 30s before the car decelerate to rest in 10s sketch the graph of the motion

2b2t

explanation:

2b2t

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!

there are no contact forces mentioned on the list of choices that you've provided.