How much time does it take the rock to travel from the edge of the building to the ground?

Question

A rock of mass m is thrown horizontally off a building from a height h, as shown. The speed of the rock as it leaves the thrower’s hand at the edge of the building is v₀.

How much time does it take the rock to travel from the edge of the building to the ground?

(A) √hv₀

(B) h/v₀

(C) hv₀/g

(D) 2h/g

(E) √(2h/g)

Answer 1

Correct option (E) √(2h/g)

Projectile. V_x doesn’t matter V_iy = 0.

Using d = v_iyt + ½ at² we get the answer.