Question

A person walking at 4m/s finds rain drops falling slant wise into his face with a speed of 4 m/s at an angle of 300 with the vertical the actual speed of the rain drops is:

Answer 1

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

Answer 2

Answer:

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