An cannon shoots a shell at a hot air balloon located H = 4 km directly above it. What is the minimum required acceleration of the shell inside the barrel if the length of the barrel is l = 1m? Assume that the motion inside the barrel is with constant acceleration.

Imagine that the rightward current flows in the rod for a short time. as a result, what will the net charge on the right and left ends of the rod become? left end negative and right end positive left end negative and right end negative left end negative and right end nearly neutral left end nearly neutral and right end positive both ends nearly neutral