An object in a fluid is being pushed back up to the surface where it will float. Which of the following diagrams shows the forces acting on the object?
Remember, the length of the arrow shows the strength of the force.

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.