Two trains, each long are travelling in opposite direction with equal velocity . The time of crossing is
Zero
Get Answer
Time
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A and B are moving with same velocity in opposite directions
velocity of is more than in same direction
velocity of and is equal in same direction
The speed of a swimmer in still water is . The speed of river water is and is flowing due east. If he is standing on the south bank and wiches to cross the river along the shortest path. The angle at which he should make his strokes w.r.t. north is given by
west
A train of length is going towards north direction at a speed of . A parrot flies at a speed of towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
So by figure the velocity of parrot w.r.t. train is so time taken to cross the train is
A boat takes 2 hours to travel and back in still water lake. With water velocity of , the time taken for going upstream of and coming back is
160 minutes
80 minutes
100 minutes
120 minutes
Velocity of boat
Velocity of water
minute
An object has velocity relative to the ground. An observer moving with a constant velocity relative to the ground measures the velocity of the object to be (relative to the observer). The magnitudes of these velocities are related by
All of these
By definition of relative velocity
and will be sides of a triangle and we know that the sum of any two sides is greater than third side of the triangle.
Two trains are each long moving parallel towards each other at speeds and respectively. After what time will they pass each other?
Relative speed of each train with respect to each other be,
Here distance covered by each train sum of their lengths
Required time .
A ship A is moving Westwards with a speed of and a ship B South of A, is moving Northwards with a speed of . The time after which the distance between them becomes shortest, is
Distance
Time taken to each the shortest distance between
and
A bus is moving with a velocity of on a straight road. A scootorist wishes to overtake the bus in one minute. If the bus is at a distance of ahead, then the velocity with which he has to chase the bus is
Speed to cover by scootarist
speed to overtake bus
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