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Questions  

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?                                     

a
19.6 ms-1
b
9.8 ms-1
c
4.9 ms-1
d
1 ms-1

detailed solution

Correct option is B

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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