The following terms are frequently used in the problems on boats and streams.
(a) Still water:
It implies that the speed of water in the river is zero.
(i) Motion In Still Water:
When an object is moving in water where there is no motion in water, the object can move in any direction with a uniform speed, then the object is said to be moving in still water.
(a) Still water:
It implies that the speed of water in the river is zero.
(i) Motion In Still Water:
When an object is moving in water where there is no motion in water, the object can move in any direction with a uniform speed, then the object is said to be moving in still water.
(b) Stream water:
It implies that the water in the river is moving.
(c).In water ,the direction along the stream is called downstream and, the direction against the stream is called upstream.
It implies that the water in the river is moving.
(c).In water ,the direction along the stream is called downstream and, the direction against the stream is called upstream.
Formulas:
1. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr,then:
2. If the speed downstream is a km/hr and the speed upstream is b km/hr,then :
1. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr,then:
Speed downstream = (u + v) km/hr.
Speed upstream = (u - v) km/hr.
2. If the speed downstream is a km/hr and the speed upstream is b km/hr,then :
Speed in still water = 1/2 (a + b) km/hr.
Rate of stream = 1/2 (a - b) km/hr.
No comments:
Post a Comment