WAEC Physics 2020 Theory — Question 6
Question 6 of 12 from the West African Examinations Council (WAEC) Physics 2020 Theory paper, with the correct answer and a full explanation.
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6. A bullet is fired from a gun at 30 deg. The bullet remains in flight for 25 s before touching the ground. Calculate the velocity of projection. (g=10 ms^-2)
Model answer
Given: theta=30 deg, T=25s, g=10m/s^2, required v=? Recall that Time of flight T=2usin(theta)/g. 25=2usin30/10. 250=2u(1/2). 250=u. Therefore, u=250 ms^-1.
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