A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 2.1 s later with an initial speed of 41.16 m/s. They hit the ground at the same time.
How long does it take the first stone to hit the ground? The acceleration of gravity is 9.8 m/s2.
Answer in units of s.
How high is the cliff? Answer in units of m.