Question

2.
An object experiences a net non-zero force. Is it possible for the
move with a constant speed along a straight line?
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Answer 1

no an object with force F has no contant speed becauae if v=constant then a=0 so according to newton 2nd law of motion;

F=ma and m is not zero and a=0 so

F=m*0=0

so F is zero if body has constant velocity.