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Maithresh Pmr Grade: 12
        

A person walking at 4m/s finds rain drops falling slantwise to his face with a speed of 4m/s at an angle of 30 degrees with the vertical. Show that the actual speed of the rain drops is 4m/s

5 years ago

Answers : (1)

rupali sehgal
19 Points
										


Velocity of rain wrt man= 4m/sat an angle 30º with vertical (given)


velocity of man wrt ground = 4m/s


from fig.


velocity of rain wrt man + velocity of man wrt ground = velocity of rain wrt ground (triangle law of vector addition)


so, velocity of rain wrt ground = √(4)2 + (4)2 + 2(4)(4)cos 120


                                          = √ 16+16+32(-0.5)


                                          =√32-16


                                          =√16 = 4m/s


hence proved!

5 years ago
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