The position of a projectile launched from the origin at t=0 is given by r =(40 i +50 j ) m at t=2 ~s . If the projectile was launched at an angle from the horizontal, then is ( . take .g=10 ~ms ⁻² )

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Correct answer: C. ⁻¹ 7 4

From question, Horizontal velocity (initial), u_ x = 40 2 =20 ~m / s Vertical velocity (initial), 50=u_ y t+ 1 2 g t² array l u_ y 2+ 1 2 (-10) 4 or, 50=2 u_ y -20 array or, u_ y = 70 2 =35 ~m / s array l = u_ y u_ x = 35 20 = 7 4 Angle = ⁻¹ 7 4 array

The position of a projectile launched from the origin at t=0 is given by r =(40 i +50 j ) m at t=2 ~s . If the projectile was launched at an angle from the horizontal, then is ( . take .g=10 ~ms ⁻² )

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