A sort of \'projectile launcher\' is shown in the figure above. A large current

Question

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 = 15.2 cm, mass m = 1.64 g, and is placed in a field of 1.73 T, what constant current flow is needed in order for it to accelerate to 29 m/s in a distance of 1.0 m?
I =

Please include solution as well as answer.

Explanation / Answer

Use the formula v2 = u2 + 2as and plug in the values!

So we find out A=450 m/s ²

now we find the force! So we have the mass and we have the acceleration and hey, we have the formula F=ma! wow, plug the values in and solve for F....which equals .675 N. But the question asks for the current.....so use the formula F=IlB and solve for the current! The answer is down.

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