A amn rowing a boat upstream is at rest with respect to shore. (a) Is he doing any work ? (b) If he stope rowing and moves down with the stream, is any work being done on him ?

A man rowing a boat upstream is at rest with respect the bank. STATEMENT-1: The man is doing no work with respect to ground. STATEMENT-2: The man is doing a positive work with respect to stream. STATEMENT-3: Work done does not depend in frame of reference.

A person is holding a suitcase and moving on a horizontal platform. Is he doing any work?

A man is rowing a boat upstream and inspite of that the boat is found to be not moving with respect to the bank. The work done by the man is

A rowboat moves in west direction upstream at 4 kph relative to water. If the current-moves east at 3 kph relative to the bank,is any work being done ?

A river is flowing with a steady speed of 4km/h. One rows his boat down stream in the river and then returns by rowing upstream in the same river.When he returns to the starting point ,the total distance covered by him is 42km.If the return journey takes 2 h more than his outward journey, then the speed of his rowing in still water must be

A man is boat intends to cross river from A. If he rows perpendicular to the banks then he takes t_1 = 10 minutes to reach the other bank and he reaches point C at a distance l = 120 m down the stream from the point B which is exactly opposite to A on the other bank. If he heads at a certain angle alpha to the straight path AB against the current he will reach point B in t_2 = 12.5 minutes. The width of river is-

In a river, a row boat is travelling down stram at a speed of 8 m/s with respected to the shore. A metor boat comes from the oposite direction at a speed of 10 m/s with respect to water. 10 seconds after crossing each other they are at 160 metres separtion. Find the speed of row boat in still water in m/s.