Question

an object experiences a net zero external unbalanced force is it possible for the object to be travelling with a non zero velocity?if yes state the conditions that must be placed on the magnitude and direction of the velocity if no provider reason

Answer 1

Hey
The velocity can be negative and postive or zero. Since it is non zero we consider negative and positive.
It's positive when the direction is same as that of velocity.
Negative when it is going opposite in direction ,that is, in negtive x-axis.
Hope it helps
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Answer 2

Hey.

As there is zero net external unbalanced force it is surely possible for the object to be travelling with a non zero velocity.

According to the Newton's first law of motion or law of inertia if there is no ext. unbalanced force acting on a body it will remain in its inertia.

Let's say the body is travelling with certain uniform velocity then it will remain traveling with the same velocity as there will be no force or hence no acceleration to change it's velocity. The magnitude and the direction both won't be affected as there will be no acceleration (force= ma=0) which is only responsible for the change in both magnitude as well as direction .

As F = ma = 0 => a = 0 ;

also v = u + at

v = u .....{ if a = 0}

The condition on the magnitude and direction will be :

1. magnitude must be a constant i.e., uniform velocity

2. direction must be unidirectional i.e., linear and no change in direction will be allowed.

Thanks.