A ball is thrown at 32 m/s [up] from the edge of a cliff 45 m high. What is the maximum height of the ball and at what speed will the ball strike the ground?
1 Answer
Explanation:
Given: A ball is thrown at 32 m/s up on a cliff 45 m high. What is maximum height and what is the speed when the ball strikes the ground?
The equation for the height :
where
For the given data:
Find the maximum height:
Find the time it takes for the ball to hit the ground (h = 0) :
Use the quadratic formula:
We are only interested in the positive answer:
Find the speed when the ball hits the ground :