A worker drops a wrench from the top of a 859m tall tower Wh

A worker drops a wrench from the top of a 85.9m tall tower. What

Solution

The drop of the wrench and its displacement due to gravity is discribed by height of fall s = 0.5gt^2, where gis acceleration due to gravity.

85.9 = (0.5)gt^2 or t= sqrt[(85.9/(0.5*9.8)]=4.1868957397 secs

The final gvelocity of the wrench when it hits the ground is given by v=u+gt, wher v is final velocity and u is the intial velocity, which is zero

v=0+9.8*(4.186957397)=41.03m/s is the velocity when the wrench reaches the ground.