The class is about Electricity and Magnetism. The website wants exactly the perfect answer and in the same metric system units that are stated on the calculators that are on the picture for the question, if not, it'll mark it wrong.

Magnetic Launcher A sort of 'projectile launcher' is shown in the figure above. A large current moves in a closed loop composed of fixed conducting rails, a power supply, and a very light, almost frictionless metal bar touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has length L = 19.4 cm, mass m = 1.61 g, and is placed in a field of 1.88 T, what constant current flow is needed in order for it to accelerate to 32 m/s in a distance of 1.0 m? I = A abc xB sin(x 0x10 Submit Reset Reset All .Start by finding the magnetic force on the bar, which determines its acceleration via Newton's second law F = ma. The kinematic relation v2= 2ax may be helpful (where v is the velocity attained by an object having acceleration a over a distance x.)