Q.

As shown in the below figure a body is projected up the incline plane  of inclination θ ,then the time of flight is

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a

T=u sin (α−β)2g cos β

b

T=u sin (α−β)g cos β

c

T=2u sin (α−β)g cos β

d

T=u sin (α+β)g cos β

answer is C.

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Detailed Solution

Here angle made by projectile with respect to inclined plane θ=α−β component of acceleration due to gravity perpendicular to plane =a=gcosβ Time of flight =T=2usinθa substitute these values, T=2usinα−βgcosβ
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As shown in the below figure a body is projected up the incline plane  of inclination θ ,then the time of flight is