more work problems.pdf

Problem a ball is dropped from a height of 10 m what

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Problem : A ball is dropped from a height of 10 m. What is its velocity when it hits the ground? The ball is acted upon by a constant gravitational force, mg . The work done during its total trip, then, is simply mgh . By the Work- Energy theorem, this causes a change in kinetic energy. Since the ball initially has no velocity, we can find the final velocity by the equation: 7 "crazy" women literature who w actually being totally reasonab 8 "gross" things we're reclaiming behalf of girls everywhere Harry Po ! er vill ranked from "ki evil" to "literally WORST" QUIZ: What's yo make-out style? Pride and Prejud as told in a serie of texts Every Shakespe play summed up a single senten 5 literary antagonists wh were technicall the good guys, you think about Valentines from fictional charac Take a Study Break! Share 69 By keyword

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W = Δ K mgh = mv 2 Solving for v , v = = = 14 m/s The final velocity of the ball is 14 m/s. We found this by one simple calculation, avoiding the cumbersome kinematic equations. This is an excellent demonstration of the advantages of working with the concepts of work and energy, as opposed to simple kinematics. Problem : A ball is thrown vertically with a velocity of 25 m/s. How high does it go? What is its velocity when it reaches a height of 25 m? The ball reaches its maximum height when its velocity is reduced to zero. This change in velocity is caused by the work done by gravitational force. We know the change in velocity, and hence the change in kinetic energy of the ball, and can calculate its maximum
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