Question

A body is revolving in a circle with decreasing speed. If y be the velocity and e be acceleration at any instant, then a​ angle between acceleration and velocity vector is 90 degree. b angle between acceleration and velocity vector is more than 90 degree c angle between acceleration and velocity vector is less than 90 degree

Answer 1

Answer:

When a body moves in circular path then its velocity is changing as velocity is a vector quantity and since the direction of the body will change it's velocity will also change continuously. This change implies acceleration. Thus it allows the body to go round the circle having the velocity vector tangent to the circular trajectory and acceleration at 90° to it directed towards the center.

Answer 2

QUESTION:-

A body is revolving in a circle with decreasing speed. If y be the velocity and e be acceleration at any instant, then

• a angle between acceleration and velocity vector is 90 degree.
• b angle between acceleration and velocity vector is more than 90 degree
• c angle between acceleration and velocity vector is less than 90 degree

ANSWER:-

• a. angle between acceleration and velocity vector is 90 degrees is the correct option.

EXPLANATION:-

• When a body is revolving in a circular path with decreasing speed then its velocity (y) is changing as velocity is a vector quantity and as the direction of the body will change its velocity will also change in constantly.

• This change indicates acceleration (e). Therefore allowing the body to go round the circle having the velocity vector (y) tangent to the circular trajectory and acceleration at 90° to it directed towards the centre.

• As we know, when the direction of the acceleration (e) when is at exactly 90° then it is constantly perpendicular or Normal to the direction of the velocity (y). And when the direction of the velocity vector changes then the direction of the acceleration (e) vector changes with it continuing at 90°, Normal, to the velocity vector (y).

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