4) You have a spring-loaded air rifle. When it is loaded, the spring is
1 answer:
The potential energy of the spring is 6.75 J
Explanation:
The elastic potential energy stored in a spring is given by the equation:
where
k is the spring constant
x is the compression/stretching of the string
For the spring in this problem, we have:
k = 150 N/m is the spring constant
x = 0.3 m is the compression
Substituting, we find
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Answer:
The initial velocity of the ball is <u>39.2 m/s in the upward direction.</u>
Explanation:
Given:
Upward direction is positive. So, downward direction is negative.
Tota time the ball remains in air (t) = 8.0 s
Net displacement of the ball (S) = Final position - Initial position = 0 m
Acceleration of the ball is due to gravity. So, (Acting down)
Now, let the initial velocity be 'u' m/s.
From Newton's equation of motion, we have:
Plug in the given values and solve for 'u'. This gives,
Therefore, the initial velocity of the ball is 39.2 m/s in the upward direction.