can be both positive and negative
can be zero depending on its position in the track
can be zero depending on its inertia in the track
a centrifugal
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Option B and C are the same and both are very wrong.
mementum depends on mass and velocity
momentum = mass × velocity
when object move around a circular path, the following should be noted
-speed is constant but velocity varies due to constant change in direction
hence, velocity is constant in magnitufe but varies in direction
-kinetic energy is constant since v is constant in magnitude
-work done equals zero since the movement is about a fixed point
-momentum is constant in magnitude by varies in direction (momentum can be positive or negative depending on its direction)
OPTION A is the right option
Be careful with this question, your understanding of the basic difference between a vector quantity (like velocity) and a scalar quantity (like speed) will make the difference.
A body may be travelling with constant speed in a circle, but this does not imply that the velocity is also constant. This is because velocity is a vector which in addition to magnitude, also depends on direction.
Now, as the body moves with constant speed IN A CIRCLE, its velocity will not be constant, but will be changing as the direction of the body changes.
However, because momentum is simply another vector which can be calculated as = mass X change in velocity, the only condition for a zero momentum is if the velocity is constant, but fortunately we have a changing velocity.
Hence, the momentum for a body travelling in a circle can never be zero but may be negative or positive depending on the current direction of the body.
Option A is the answer ✔️✔️
