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Question

A projectile is launched with a speed of 10 m/s at an angle 60 with the horizontal from a sloping surface of inclination 30. The range R is (Take g=10 m/s2)

A
4.9 m
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B
13.3 m
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C
9.1 m
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D
12.6 m
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Solution

The correct option is B 13.3 m
At B, Sy=0

uy t+12ayt2=0
or t=2uyay=2(10)10×3/2=43s
Now, AB=R=12axt2=12(10×12)(163)=13.33 m.

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