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At a height 0.4 m from the ground, the velocity of a projectile in vector form is The angle of projection is
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a
45o
b
60o
c
30o
d
tan-1 (3/4)
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Correct option is C
v2=u2-2gh or u2=v2+2gh ux2+uy2=vx2+vy2+2gh,ux=vx uy2=vy2+2gh or uy2=(2)2+2×10×0.4=12 uy=12=23 ms-1,ux=vx=6 ms-1 tanθ=uyux=236=13 ⇒ θ=30°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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