Suppose a particle is accelerated through space by a constant 10-n force. suddenly the particle encounters a second force of 10-n in a direction opposite to that of the first force. the particle

The particle will continue moving at constant velocity

Explanation:

When the particle encounters the second force of 10 N, the net force acting on the particle becomes zero, because the two forces are equal in magnitude but opposite in direction:

For Newton's second Law, the acceleration of the particle is proportional to the net force acting on it:

Therefore, since , the acceleration is zero (a=0) and so the particle will keep a constant velocity.

not really sure but thinking 1.54 mm/us