You drop a 30 g pebble down a well. You hear a splash 2.7 s later. What was the pebble's speed just as it reaches the water? Assume g = 9.8 m/s2

Question

Cullen Valenzuela

Physics

4 August, 06:32

You drop a 30 g pebble down a well. You hear a splash 2.7 s later. What was the pebble's speed just as it reaches the water? Assume g = 9.8 m/s2

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Dixon · Answer 1

vf=vi+at

No need for rearranging because it is already set up for Vf (final velocity)

a = - 9.8m/s² (because it is falling)

vi = 0

t = 2.7

0 + - 9.8 (2.7) = vf

vf = - 26.5 (-26.46)