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Question

A car with a vertical windsheld moves in a rain storm at a speed of 40km/hr. The rain drops fall vertically with constant speed of 20m/s. The angle at which rain drops strike the windsheild is

A
tan159
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B
tan195
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C
tan132
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D
tan123
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Solution

The correct option is A tan159
The horizontal component of falling rain is 40km/hr
Convert km/hr into m/s
40km/hr=40×518m/s=20018m/s
The vertical component of falling rain is 20m/s
Now,
Q=tan1(HorizontalVertical)
Q=tan1(200/1820)
Q=tan1(59)


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