Answer:
- The speed will be

Explanation:
We can use the following kinematics equation

where
is the final speed,
its the initial speed, a is the acceleration, and d the distance.
The force will be tripled, the force is:

in 1D

Now, for the original problem, we have



For the second problem, we have

starting from the rest, we have the same initial velocity.


As the force is tripled, we have:


But the mass its the same, so


So the acceleration its also tripled.


As the distance traveled by the arrow must also be the same, we have:





And this will be the speed from the arrow leaving the bow.