Question

Three Questions
1.Can a body moving with uniform speed have variable velocity??
2.Can a body moving with uniform velocity have variable speed??
3.Can average velocity ever become equal to instantaneous velocity??
4.Can a body have acceleration with zero velocity??
5.Can the direction of velocity change even if acceleration is constant??
Explain Ur answers with proper examples or hints!!

Answer 1

@theEric @FoolAroundMath @Kainui @coolsector @kropot72 @zepdrix @agent0smith

Answer 2

@souvik @surjithayer

Answer 3

@Paynesdad @Preetha

Answer 4

@Fifciol

Answer 5

1. yes in circular motion speed does not change while velocity(vector, has the direction that changes all the time while speed is only a scalar so it has only a magnitude that doesn't change) changes

Answer 6

k........Second case??

Answer 7

2 It's not possible. speed is only magnitude , while velocity consists of magnitude(speed) but also direction etc.

Answer 8

M not gtin u at the second part!!

Answer 9

3.when velocity is constant in time instantaneous velocity is the same in every moment as average velocity

Answer 10

1st Check,3rd Check,2nd still doubt!!

Answer 11

4th and 5th??

Answer 12

4 of course it can have. when you throw an apple upwards there's always gravity that acts on an object, that means certain acceleration that gravity wants the object to have, but there is moment when apple reaches maximum height: velocity is zaero but object is always accelerated downwards in every moment in time with the same value( assuming you don't throw it too high:) )

Answer 13

lol.......Yeah Got 4th.....

Answer 14

5th and 2nd left

Answer 15

5 It's not possible. Acceleration is also a vector. They are connected by relation:
\[a^{\rightarrow}=\frac{ dv^{\rightarrow} }{dt }\] (Idk how to draw arrows right at the top, plz tell me :) ) That means when velocity vector changes the acc vector must also change.
There is a situation (circular motion) when magnitude of acc doesn't change and velocity vector changes all the time. but there's written only acceleration which itself isa vector

Answer 16

k

Answer 17

\[{\rightarrow}\]a

Answer 18

thats the closest I get @Fifciol

Answer 19

Can u xplain 2nd one one more time??

Answer 20

it's simply because velocity consists of speed

Answer 21

but velocity can change direction and speed not but that velocity is variable

Answer 22

If it covers unequal dist having displacements equal...wont that be true??

Answer 23

for 2nd case??

Answer 24

and constans mean in every moment in time

Answer 25

2.Can a body moving with uniform velocity have variable speed??

If velocity doesn't change, how can speed? Speed is just the magnitude or absolute value of velocity.

If an object has constant velocity 10m/s west, how can it's speed ever change from 10m/s?

Answer 26

If you're driving 100km/h north, will your speed ever change from 100km/h?