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An object is projected for the hieght of 80 m a... - JAMB Physics 2005 Question

An object is projected for the hieght of 80 m above the ground with a velocity of 40ms-1 at the angle of 30° to the horizontal. The time of flight

A
8 s
B
4 s
C
16 s
D
10 s
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Correct Option: B

for a body projected at an angle θ to the horizontal, the time of the flight is given by T = (2u sin θ)/g =(2x 40)x sin (30)/10 =(2 x 40) x (0.5)/10 = 4.0secs.

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