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a rock falls from 180m from a cliff into the ocean. how long is it in free fall
a = 9.81 (acceleration is constant at this value on Earth) vi = 0 (the rock has initial speed 0) d = 180 (the height of the fall/cliff)
So we use the formula S = vi*t + 1/2(a)(t)² 180 = 0(t) + 1/2(9.81)(t)² 180 = 4.905t² t² = 36.697 t = 6.0578
a = 9.81 (acceleration is constant at this value on Earth) vi = 0 (the rock has initial speed 0) d = 180 (the height of the fall/cliff)
So we use the formula S = vi*t + 1/2(a)(t)² 180 = 0(t) + 1/2(9.81)(t)² 180 = 4.905t² t² = 36.697 t = 6.0578