Hooke's law relates
A. The spring force to the force used to compress the spring
B. Change of the length of the spring to gravity
C. Change of the length of the spring to the metal the spring is made of
D. The spring force to the change in the length of the spring
Ans: D. The spring force to the change in the length of the spring
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A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground. Determine the initial speed of the ball.
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