1. Gas sample A has a mass of 32.00 grams. Gas sample B has a mass of 28.00 grams. If the two gas samples are both at 25°C, which sample has the greatest average kinetic energy?

The stopwatch used by a student to measure velocity of a pulse in a slinky was of least count 0.1 second. he stops the stopwatch when a pulse has made 3 journeys from one end to the other of the slinky. he finds the seconds hand to be at 52nd division. calculate the correct time noted by him.