m fri sep 12\ntake quiz\nthe acceleration at a is positive and less than the acceleration at b.\nthe…

m fri sep 12\ntake quiz\nthe acceleration at a is positive and less than the acceleration at b.\nthe acceleration at b is positive and less than the acceleration at a.\nthe accelerations at a and b cannot be determined.\nthe accelerations at a and b are each zero.\nquestion 4\nwhen a cars velocity is negative and its acceleration is negative, what is happening to the cars motion?\nthe car remains at rest.\nthe car travels at constant speed.\nthe car slows down.\nthe car speeds up.\nquestion 5\nmotion of ball moving on ramp

m fri sep 12\ntake quiz\nthe acceleration at a is positive and less than the acceleration at b.\nthe acceleration at b is positive and less than the acceleration at a.\nthe accelerations at a and b cannot be determined.\nthe accelerations at a and b are each zero.\nquestion 4\nwhen a cars velocity is negative and its acceleration is negative, what is happening to the cars motion?\nthe car remains at rest.\nthe car travels at constant speed.\nthe car slows down.\nthe car speeds up.\nquestion 5\nmotion of ball moving on ramp

Answer

Explanation:

Step1: Recall velocity - acceleration relationship

Acceleration is the rate of change of velocity. If velocity $v$ and acceleration $a$ have the same sign, the speed of the object increases. If they have opposite signs, the speed decreases. If $a = 0$, the speed is constant (assuming no non - acceleration related forces like friction etc. acting to change speed). If $v=0$ and $a = 0$, the object is at rest.

Step2: Analyze Question 4

The car has negative velocity and negative acceleration. Since they have the same sign, the magnitude of the velocity (speed) is increasing. So the car is speeding up.

Answer:

Question 4: The car speeds up.