Question

-0.2
A man holding umbrella to negotiate rain. When he is standing, he holds the
Umbrella at an angle 30 with the vertical. When he starts running at
the rain appears to fall vertically. We need to find the velocity of rai​

Answer 1

Velocity of the man v
m
​
running with is 10
i
^

when man run he found that rain falling verticaly hitting his head
Let velocity of rain with respact to man v
r/m
​
=−v
j
^
​

velocity of rain v
r
​
=v
r/m
​
+v
m
​
=−v
j
^
​
kmph+10
i
^
kmph
tan30
0
=
v
10
​

⇒v=10
3
​
kmph
we gat v
r
​
=10
i
^
−10
3
​

j
^
​

magnitude we v=
10
2
+(10
3
​
)
2

​
=20kmph
Hence B option is correct

Answer 2

Answer:

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