"for the instant represented, car a has an acceleration in the direction of its motion. car b is moving on a circular path and has a speed vb which is increasing. if the acceleration of b as observed from a is zero for this instant", determine the magnitude of acceleration of a and the rate at which the speed of b is changing

Both the cars would have same acceleration, then only car A is able to see zero acceleration of Car B. This is because, we know that car B is definitely accelerating as it is moving with speed in a circular path. Let the acceleration of Car B be , then .

The two cars A and B would have same acceleration i.e. the rate of change their velocities would be equal.

i think it's 35 meters

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.

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