A rock falls from a cliff and strikes the ground in 10.0 seconds. Calculate the cliff's height.

Question

Physics short answer problem 

Answer 1

Hi Agrila,

 

According to the Kinematic Equation of free fall, which is the case here, distance, d, can be calculated by

d = Vi*t + 1/2*a*t^2

where, Vi is the initial velocity

a is the acceleration, and

t is time

Vi = 0

a = g (gravity, which equals 9.8 m^-2)

t = 10 sec, so

d = 1/2*9.8*10^2 

= 490 m (is the height of the cliff).