Question

A person walking at 4m/s find raindrops falling slantwise in to his face with a speed of 4m/s at an angle of 30 with the vertical show that the actual speed of the raindrop is4m/s

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Answer 1

Answer:

11th

Physics

Motion in a Plane

Relative Motion in 2 Dimension

A person walking at 4m/s fi...

PHYSICS

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 30

0

with the vertical the actual speed of the rain drops is:

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ANSWER

The velocity of rain with respect to the man=4m/s at an angle 30° with vertical.

Also, it is given that the velocity of the man with respect to ground=4m/s

The velocity of rain wrt man+velocity of man wrt ground = velocity of rain wrt ground i.e actual velocity of the rain

(by using and applying triangle law of vector addition)

So, velocity of rain wrt ground=

4

2

+4

2

+2(4)(4)cos120

=

16+16+32(−0.5)

=

32−16

=

1

6

=4m/s

Therefor