A ball is rolled off along the edge of a horizontal table with velocity 4 m/s. It hits the ground after time 0.4 s. Which of the following are correct?
Select all that apply

Question

A ball is rolled off along the edge of a horizontal table with velocity 4 m/s. It hits the ground after time 0.4 s. Which of the following are correct?

G1 Physics · Accepted Answer

With horizontal speed 4 m/s and flight time 0.4 s, horizontal distance = 4(0.4) = 1.6 m, so C is correct. Taking g = 10 m/s², table height = ½g(0.4)² = 0.8 m, so A is correct, and the impact vertical speed is gT = 4 m/s, so D is also correct. Since vₓ = vᵧ = 4 m/s at impact, the direction is 45° with the vertical, not 60°, so B is false. Therefore A, C and D are correct. The printed source key omits D.