(b) a person standing on the ground throws a ball onto a flat rooftop. the ball rolls around for several…
(b) a person standing on the ground throws a ball onto a flat rooftop. the ball rolls around for several seconds. then the ball falls off the roof, into a puddle of mud.
Answer
Explanation:
Step1: Analyze ball - throwing phase
The ball is thrown from the ground to the rooftop, so its height increases with time.
Step2: Analyze ball - rolling phase
On the flat rooftop, the height of the ball remains constant for several seconds as it rolls.
Step3: Analyze ball - falling phase
The ball then falls off the roof into the mud, so its height decreases with time.
Answer:
The first graph (where the height is initially constant at ground - level, then increases to a new constant level on the rooftop, and then remains at that constant level for a while before decreasing to the ground - level again) is the correct one.