Grade 12th passMechanics

A swimmer crosses a river in shortest distance. If he tries to swim at 4 km/ hr maintaining 120 with the downstream then speed of the river is

Subhra

7 Years agoGrade 12th pass

5 Answers

Saurabh Koranglekar

7 Years ago

Dear student

Draw the vector triangle you would find 4 cos 60 = speed of river

Ie speed of river is 2 m/s

Regards

Khimraj

6 Years ago

The speed of the river is 2 km/hr.

Explanation:

Given that,

Velocity of swimmer = 4 km/hr

Angle = 120°

We need to draw a figure,

Here, is the velocity of swimmer w.r.to river, is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.

Put the value in equation (I)

Hence, The speed of the river is 2 km/hr.

aswanth nayak

6 Years ago

Draw the vector triangle you would find 4 cos 60 = speed of riverIe speed of river is 2 m/The speed of the river is 2 km/hr.

Explanation:

Given that,

Velocity of swimmer = 4 km/hr

Angle = 120°

We need to draw a figure,

Here, is the velocity of swimmer w.r.to river, is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.

Put the value in equation (I)

Hence, The speed of the river is 2 km/hr.

aswanth nayak

6 Years ago

Dear student,Draw the vector triangle you would find 4 cos 60 = speed of riverIe speed of river is 2 m/s

Regards

aswanth nayak

6 Years ago

Dear Student

The speed of the river is 2 km/hr.

Explanation:

Given that,

Velocity of swimmer = 4 km/hr

Angle = 120°

We need to draw a figure,

Here, is the velocity of swimmer w.r.to river, is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.

Put the value in equation (I)

Hence, The speed of the river is 2 km/hr.

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A swimmer crosses a river in shortest distance. If he tries to swim at 4 km/ hr maintaining 120 with the downstream then speed of the river is

Subhra

5 Answers

Saurabh Koranglekar

Khimraj

aswanth nayak

aswanth nayak

aswanth nayak

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