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Q.

A projectile is thrown with initial velocity u0 and angle 30° with the horizontal. If it remains in the air for 1s, what was its initial velocity?

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a

19.6 ms-1

b

9.8 ms-1

c

4.9 ms-1

d

1 ms-1

answer is B.

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Detailed Solution

Time of flight,  T = 2u sinθgGiven,  u=u0,T=1 s,θ=30°,g=9.8 ms-2            u0 = g = 9.8 ms-1
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