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Question


To a man running on incline plane at 5 m/s as shown in figure, rain appears to be falling vertical at 2 m/s. Speed of rain with respect to ground is


A

8 m/s
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B

51 m/s
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C

86 m/s
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D

41 m/s
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Solution

The correct option is D
41 m/s
VR,G = VR,m - VG,m = VR,m + Vm,G
VR,G = -2^j + (4^i - 3^j) = 4^i - 5^j
|VR,G| = 42+52 = 41 m/s

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