A science test, which is worth 100 points, consists of 24 questions. Each question is worth either 3 points or 5 points. If x is
1 answer:
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Answer:
The ball will reach a maximum height of 39.993 meters after 1.428 seconds.
Step-by-step explanation:
Let suppose that no non-conservative forces acts on the ball during its motion, then we can determine the maximum height reached by the Principle of Energy Conservation, which states that:
(1)
Where:
,
- Initial and final translational kinetic energies, measured in joules.
,
- Initial and final gravitational potential energies, measured in joules.
By definition of translational kinetic energy and gravitational potential energy we expand and simplify the expression above:
(2)
Where:
- Mass of the ball, measured in kilograms.
- Gravitational acceleration, measured in meters per square second.
,
- Initial and final speed of the ball, measured in meters per second.
,
- Initial and final heights of the ball, measured in meters.
The final height of the ball is determined by the following formula:
(3)
If we know that ,
,
and
, the maximum height that the ball will reach is:
The ball will reach a maximum height of 39.993 meters.
Given the absence of non-conservative forces, the ball exhibits a free fall. The time needed for the ball to reach its maximum height is computed from the following kinematic formula:
(4)
If we know that ,
and
, then:
The ball will take 1.428 seconds to reach its maximum height.