When a wave moves through an opening in a barrier it
2 answers:
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4) none of these matter. with no air resistance, they all hit the ground at the same time.
Explanation:
The motion of the objects is a free fall motion, since the only force acting on them is gravity. Therefore, it is a uniformly accelerated motion with constant acceleration (acceleration of gravity) towards the ground, and so we can find the time of flight by using the suvat equation:
where
s is the vertical displacement (equal to height of the tower)
u = 0 is the initial velocity
t is the time
is the acceleration
Re-arranging the equation.
As we can see, the time of flight depends only on the height of the tower (s) and the acceleration due to gravity (g): therefore, the three objects reach the ground at the same time.
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Answer: 88 m/s
Explanation:
If we are talking about an acceleration at a uniform rate, we are dealing with constant acceleration, hence we can use the following equation:
(1)
Where:
Is the final velocity of the plane (we know it is zero because we are told the pilot stops the plane at a specific distance)
Is the initial velocity of the plane
is the constant acceleration of the plane
is the distance at which the plane stops
Isolating from (1):
(2)
(3)
Finally:
This is the veocity the plane had before braking began