Question

A rock is dropped, from rest, from a height of 8.9 m above the ground at t = 0 s. At the same time that the rock is dropped a stone is thrown upward from a height of 1.1 m above the ground at a speed of 7.1 m/s. The stone travels straight upward toward the rock. There is no air resistance.

a. Determine the height above the ground where the rock hits with the stone. Blank 1. Calculate the answer by read surrounding text. m

b. At what new height should the rock be dropped so that when it hits the stone, the stone is at its maximum height above the ground? Blank 2. Calculate the answer by read surrounding text. m

Answer 1

Part A) let us first calculate the time when   

Now the height at which stone hit the rock

Part B) Now the maximum height

Now time taken to reach the maximum height

Now distance moved by rock in this time

Now height from where the stone must be dropped in order to