Which car is accelerating? a) a car that is unmoving b) a car that rounds a curve at a constant speed c) a car that travels in straight line at a constant speed eliminate d) a car that is set to a constant speed of 60 miles per hour

The correct option is B) a car that rounds a curve at a constant speed because the direction of speed is changing.

Explanation:

Acceleration tells us how the speed changes. Therefore, it relates the changes in speed with the time it takes to produce.

So the acceleration is:

You know what acceleration is related to the speed change. And speed is vector, so it has magnitude and direction. So when a change in speed occurs, it means that the object is accelerating.  

So when the acceleration is produced by changing the value of the magnitude of the velocity it is called tangential acceleration.

 And when the acceleration is produced by changing the direction of the velocity it is called centripetal acceleration. The direction is perpendicular to the route followed by the mobile and its direction points towards the center of curvature.

Finally the correct option is B) a car that rounds a curve at a constant speed because the direction of speed is changing.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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