Question

A rock is dropped from the top of a tall building. How high is the building if it takes 3.25seconds for the rock to strike the ground? Ignore the effects of air resistance. A) 169m B)15.9m C)51.8m D) 32.2m

Answer 1

C)51.8m

Step-by-step explanation:

Kinematics equation:

`y=v_(oy)*t+1/2*g*t^2`

in this case:

`v_(oy)=0`

`y=1/2*9.81*3.25^2=51.8m`