Answer:
<h3>We need to apply a force of 15 Netwons in order to move the block at a constant velocity.</h3><h3>For the second context the acceleration is 4.90 meters per square second.</h3>
Explanation:
Notice that the problem is about a block, which we need to move with constant velocity, that means there's no acceleration, because the velocity doesn't variate.
We use Newton's Second Law
Where and (friction coefficient).
In this case, we know that , because there's no acceleration.
Where,
Therefore, , which means we need to apply a force of 15 Netwons in order to move the block at a constant velocity.
Now, in case we use double force , we need to find the mass of the block using
Now, according to Newton's Second Law, we have
Replacing all values and solving for , we have
Therefore, for the second context the acceleration is 4.90 meters per square second.