science of everyday life

👨🏻‍🏫 學術台其他 - 科學

Wai Man

2011-04-10 10:45 pm

Ineach case, give an example if your answer is yes; explain why ifyour answer is no.
Canan object have a constant velocity and still have a varying speed?Canthe velocity of an object reverse direction when its acceleration isconstant?Canan object be increasing in speed as the magnitude of itsacceleration decreases?
thankyou fo helping me... i just cant understand those QQ...

更新1:

1. Can an object have a constant velocity and still have a varying speed? 2. Can the velocity of an object reverse direction when its acceleration is constant? 3. Can an object be increasing in speed as the magnitude of itsacceleration decreases?

更新2:

why QQ1's answer is no? could you explain it to me? thankyou

回答 (2)

天同

2011-04-11 1:02 am

✔ 最佳答案

1. No

2. Yes
An example is a stone thrown upward. When it reaches its highest point and is ready to fall, its velocity reverses in direction, but the acceleration (acceleration due to gravity) is constant.

3. Yes.
Although the magnitude of acceleration decreases, there is still a non-zero acceleration. Under this acceleration, the object definetly will pick up speed.

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Wai Man

2011-04-11 1:20 am

why QQ1's answer is no? could you explain it to me? thankyou

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