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

8 s

4 s

16 s

10 s

Correct answer is 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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