Question

choose the correct alternative

1. The acceleration of a moving particle is always in the direction of its velocity
2. velocity or acceleration vectors of a moving particle may have any angle between 0 and 360 between them
3. Velocity and acceleration vectors of a moving particle may have any angle between 0 to 180 between them
4. If the acceleration vector always perpendicular to the velocity vector of the moving particle, the velocity vector does not change.


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Answer 1

Answer:

b is the correct

..see here

1. it is totally incorrect acceleration can act opposite or in the same direction of velocity we have very examples ....like brake examples etc
2. velocity and acceleration can act any at angle upon each other...as they are vectors...result will come through every angles
3. i think this may be incorrect due to only 180° range of it...it could be any angle
4. in the circular motion itself we see that the centripetal acceleration is perpendicular to v vector..it doesn't change the magnitude but changes the direction..so velocity ultimately changes as it is direction dependent

hope its correct...

Good luck