(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long would it take to reach the ground if it is thrown straight down with the same speed?

Step-by-step solution 47PE Step 1 of 3 From the equation of motion, Here, y is the final position of the object, yo is the initial position of the object, u is the initi al velocity is the time in terval and a is the acceleration of an object. Step 2 of 3 (a) Substitute 0 m for yo, for , 2.35 s for and for . Or, the initial position of the rock is, Hence, the height of the cliff is .