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Q.

Trajectories of two projectiles are shown in figure, let T1 and T2 be the periods and u1 and u2 are their speeds of projections, then                                    [UP CPMT 2012]

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a

u1 > u2

b

T1 = T2

c

u1 < u2

d

T2 > T1

answer is D.

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Detailed Solution

 

H1 > H2

u1sin α1>u2 sin α2  Since α1>α2   we conclude u1<u2

Also T =  2u sin α2. 

Since u1 sin α1>u2 sin α2 , we can conclude T1>T2

 

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