WAEC Physics 2017 Theory — Question 2
Question 2 of 33 from the West African Examinations Council (WAEC) Physics 2017 Theory paper, with the correct answer and a full explanation.
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2. A particle is projected horizontally at 15ms^-1 from a height of 20m. Calculate the horizontal distance covered by the particle just before hitting the ground. [g=10ms^-2]
Model answer
H=ut(vertical)+1/2gt²; since initial vertical velocity=0: H=1/2gt². 20=1/2x10xt² → t²=4 → t=2s. Horizontal distance R = u_x x t = 15x2 = 30m.
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