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A particle is projected from a point on ground making an angle of 30o with horizontal. At time t1=2sec and t2=4sec, it is at the same height h above the ground. Then speed of projection is (g=10m/s2)

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Detailed Solution

Time of flight T= t1+t2= (2+4) sec = 6 secNow, 2usinαg=T⇒2usin30o10=6⇒u=60 m/s

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A particle is projected from a point on ground making an angle of 30o with horizontal. At time t1=2sec and t2=4sec, it is at the same height h above the ground. Then speed of projection is (g=10m/s2)