The auto in the sketch moves forward as the brakes are applied. a bystander says that during the interval of braking, the auto's velocity and acceleration are in opposite directions. do you agree or disagree?

The statement is true: velocity and acceleration have opposite directions in the interval of braking.

Explanation:

Let's say we have a velocity .

The acceleration is the rate of change of the velocity . This means that if is increasing during time, then must be positive. But if is decreasing over time, then will be negative (even though the velocity is positive).

Mathematically:

decreases ⇒

⇒.

Example:

d) physical means can be used to separate the components of air.

not too sure thinking all accelerations are pointed down