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 boat moves right across a river with velocity 10Kmh^(-1) relative to water. The water has a uniform speed of 5.00Kmh^(-1) relative to the earth. Find the velocity of the boat' relative to an observer standing on either bank. If the width of river is 3.0Km , find the time it takes the baat to cross it.

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 river of width a with straight parallel banks flows due north with speed u. The points O and A are on opposite banks and A is due east of O. Coordinate axes O_x and O_y are taken in the east and north directions respectively. A boat, whose speed is v relative to water, starts from O and crosses the river. If the boat is steered due east and u varies with x as : u = x(a-x) v/a^2. Find (a) equation of trajectory of the boat, (b) time taken to cross the river, (c) absolute velocity of boatman when he reaches the opposite bank, (d) the displacement of boatman when he reaches the opposite bank from the initial position.

A plane moves in windy weather due east while the pilot the plane somewhat south of east. The wind is blowing at 50 km/h directed 30^(@) east of north, while the palne moves at 200 km/h relative to the wind . What is the velocity of the plane relative to the ground and what is the direction in which the pilot points the palne ?

A horizontal conveyor belt moves with a constant velocity V.A small block is projected with a velocity of 6m//s on it in a direction opposite to the direction of motion of the belt The block comes to rest relative to the belt in a time 4s. mu =0.3, g =10 .m//s^(2) Find V .

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

Statement-1 : The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies. Statement-2 : Sometimes relative velocity between two bodies is equal to difference in velocities of the two.

A man moves 4 m along east direction, then 3m along north direction, after that he climbs up a pole a height 12m. Find the distance covered by him and his displacement.

A boat moves with speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The minimum time taken around a round trip is