Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?

a. 28 m/s
b. 14 m/s
c. 20 m/s
d. 40 m/s
e. 780 m/s


a

Physics & Space Science

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