If an object is moving with a constant speed, is it necessary that it will experience a force of 0 N ?

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Solution

Dear Student!!
No.
If the net force on the body is not zero only when the body is moving in a straight line with constant speed. Than by the relation F = ma ,
body have some acceleration. Therefore velocity is not constants when the net force on the body is not zero.
But when the body is moving with a constant speed in a circular path then there must be a force acting on the body called centripetal force.

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