Question

the force needed to start a cart is greater than the force needed to keep it moving with uniform speed give reasons

Answer 1

This is due to the first law of Newton that say that, In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.
So as in this case also the cart which is an object needs more force to start moving however it wants to be moving once it started to move.

For Better understanding:

Once the cart started to move it will need some force to overcome the ground friction acting upon it.

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