Assume that a projectile is fired horizontally from a "gun" located 1 meter above the ground. if the ball strikes the ground a distance of 2 meters from the end of the "gun" determine the muzzle velocity of the gun.

Explanation:

To determine the muzzle velocity of the gun, we must know how long does it take the ball to strikes the ground

Since the ground is at y=0 and

Solving for t

Now, to determine the muzzle velocity we need to find its acceleration first

(1)

(2)

If we analyze the final velocity is 0. From (2) we have that

(3)

Replacing (3) in (1)

Solving (3)

iron would move it is magnetic there is a mag field around the current in the wire

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it