Author Question: John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air ... (Read 22 times)

Bernana · **on:** Jul 28, 2018

John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
a. 19 m/s
b. 25 m/s
c. 610 m/s
d. 22 m/s
e. 12 m/s

Question 2

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