Answer :

Let the acceleration of the car be ‘a’. The forces on the bob from the frame of reference of the car is shown in the above picture.

Since there is no motion in the vertical direction we can say,

or, .

In horizontal direction, on applying Newton’s second law we get,

where a’ is the acceleration of the bob in the horizontal direction

with respect to the ground frame. So, we can see that there is a

net non-zero force in the horizontal direction which is responsible

for the acceleration observed.

So, there is no violation of the law of conservation of momentum.

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