If a string from a hanging mass balances the thrust of the propeller on a cart w

Question

If a string from a hanging mass balances the thrust of the propeller on a cart what will be the result if the track is level and you neglect friction?
1. the cart will either be stationary or moving at a constant velocity.
2. the cart will either be stationary or accelerating in the direction of the propeller thrust.
3. the cart will either be stationary or accelerating in the direction opposite to the propeller thrust.
4. the cart will be stationary with no possibility of moving at any velocity constant or not.

Explanation / Answer

As the Motion of the Hart is Horizontal but the Mass is Hanging Vertically.

So it can't Balance unless the cart has zero Acceleration

So

a. the cart will either be stationary or moving at a constant velocity.

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