A biker rode up a 20 km hill in 2 hours and down the hill in 0. 5 hours without stopping. What was his average speed:.

Are aliens real? justify you’re answer.

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Why do different substances have diffrent properties