Hop off of the mine cart when the electrified track runs out and there’s solid ground. Drop to the right side and stop the cart from proceeding. There’s a high electric platform above you and to the right of that is where you want to travel. Letting the cart go means it’ll triggers a switch that powers on the electricity. The trick here is to begin to push the cart to the left underneath the edge of the high platform, hop onto it the first chance you get, jump to the right to land on the platform, and run your way across before the mine cart slams into the electricity-triggering button.