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The equation, of motion of a projectile is y=12x34x2. The horizontal component of velocity is 3 m/s. Given g = 10 m/s2. What is the range of the projectile ?

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a
12.4 m
b
21.6 m
c
30.6 m
d
36.0 m

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detailed solution

Correct option is B

y=12x−34x2dydt=12dxdt−32xdxdtor      dydt=12dxdt at x=0or      dydt/dxdt=12 or tan⁡θ=12       ….. (1)Given,      ucos⁡θ=3            ….(3)Now,               R=u2sin⁡2θg=2u2sin⁡θcos⁡θg=2(usin⁡θ)(ucos⁡θ)g=2×3×3610=21.6m


Similar Questions

Assertion : When the velocity of projection of a body is made n times, its time of flight becomes n times.

Reason : Range of projectile does not depend on the initial velocity of a body.


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