Two second after projection a projectile is travelling in a direction inclined at 30º with horizontal, after one more second it is travelling horizontally. Angle of projection (in degree) with horizontal divided by 10 is –
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Ans. 6
Sol. Let angle made by 
initially and after time t be 
and 
respectively.
tan 30º = 
…(i)
tan 0º = 
…(ii)
= 60º
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