Question

How long does it take for a stone to fall from a bridge to the water 13 m below? How fast is the stone going just before it hits the water? Repeat for a bridge 40 ft above the water.

Answer 1

Answer:

24.249m/s

Explanation:

Distance= Time * Velocity/2 (The velocity which it hits the water) (Because the average velocity for the trip is Velocity/2)

30m=Time*Velocity/2

Okay, velocity in m/s is 9.8 multiplied by Time, because gravitational acceleration is 9.8 m/s^2

30= Time*4.9 Time

Time^2= 30/4.9

Time=2.474 s

Velocity: 24.249 m/s