GK
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
yes
|
|
|
no
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Yes. Even though the initial and final speeds are the same, there has been a change in direction for the object. Thus, there is an acceleration. The object was moving rightward and slowed down to 0 m/s before changing directions and speeding up while traveling leftward.
Detailed explanation-2: -Remember that acceleration is a change in speed. A car that is slowing down is decreasing its speed. It is also accelerating, because its speed is changing. Imagine a car being driven down a road.
Detailed explanation-3: -According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.
Detailed explanation-4: -Acceleration is how fast velocity changes: Speeding up. Slowing down (also called deceleration) Changing direction.
Detailed explanation-5: -When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.