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A light body is projected with a velocity 00i+20j+20 k) ms. Wind blows alongX-axis with an acceleration of 2.5 ms. IfY-axis is vertical then the speed of particleafter 2 second will be (g 10 m )(A) 25 ms (B) 10/5 ms(0) 30 m(D) None of these |
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Answer» Option (D) None of theseExplanation:GivenVelocity of the body = Acceleration of the wind in the X direction = 2.5 m/s^2Since the wind will be blowing opposite to the motionTherefore, it will be negativeor, After 2 seconds the component of the velocity in the x direction will bev = u + at (USING FIRST EQUATION of motion)v = 0 - 2.5 × 2or v = -5 m/sAlso the acceleration DUE to gravity will be acting in the y-directionTherefore, velocity in y-direction after 2 secondsv'= u'-gt v'= 20 - 10 × 2or, v' = 0Therefore the velocity vector after 2 seconds will beSpeed of the particle m/s |
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