Question

a stone is dropped from a cliff onto a flowing river below. if it takes the stone 0.185 minutes to hit the water, how high is the cliff?

Answer 1

According to the equations of the motion,
h = h₀ + v₀t - gt²/2
In our case h =0, v₀= 0, t = 0.185[minutes] *60 = 11.1 [s], g= 9.8 [m/s²]
thus
h₀ = gt²/2 = 9.8* 11.1²/2 = 603.729 [m]