Question

A worker drops a wrench from the top of a tower 92.6 m tall. What is the velocity when the wrench strikes the ground? The acceleration of grav- ity is 9.81 m/s2. Round to the nearest hun- dredth place

Answer 1

Assuming the wrench was originally at rest (u=0 m/s).
       
height = 92.6 m = s; g = 9.81 m/s2
       
s = (v^2-u^2)/2g
       
Therefore, v=sqrt(2 * g * s)
   
v = sqrt (2 * 9.81 * 92.6) m/s
   
v = 42.62 m/s