rain is falling with 4 km/h speed in downward direction and a man is moving in x direction with 3 km/h then find the angle at which the man should open the umbrella for escaping the rain
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rain is falling with 4 km/h speed in downward direction and a man is moving in x direction with 3 km/h then find the angle at which the man should open the umbrella for escaping the rain
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Explanation:
The correct option is D
5
k
m
/
h
Velocity of rain ,
→
v
r
=
−
4
^
j
Velocity of man,
−→
v
m
=
3
^
i
Let
→
v
r
m
be the velocity of rain w.r.t man
We know that
→
v
r
m
=
→
v
r
−
→
v
m
=
−
4
^
j
−
3
^
i
∴
|
→
v
r
m
|
=
√
(
−
4
)
2
+
(
−
3
)
2
=
√
25
=
5
k
m
/
h
Verified answer
Explanation:
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