A projectile is fired from the bottom of incline plane of inclination 37∘ at speed of 20 m/s at an angle θ with incline plane as shown in figure. If time of flight is 3 sec, then distance `AB` is [g=10m/s2]
A
0 m
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B
12 m
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C
17 m
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D
21 m
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Solution
The correct option is D21 m Considering x coordinate along incline and y coordinate perpendicular to incline.
Using 2nd equation of motion in y direction and given time of flight ⇒
0=20sinθ×3−12×10×45×32⇒sinθ=35
For range `AB` we write equation of motion in `x` direction ⇒