- A man can swim in still water with a velocity of 4m/s. He crosses a river directly perpendicular to the river when he heads 30° with
the normal to the riverbank. The velocity of the river is:​

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.