Engineering Mechanics - KOP: Work and Energy - Discussion

Discussion :: KOP: Work and Energy - General Questions (Q.No.4)

4. 

The firing mechanism of a pinball machine consists of a plunger P having a mass of 0.25 kg and a spring of stiffness k = 300 N/m. When s = 0, the spring is compressed 50 mm. If the arm is pulled back such that s = 100 mm and released, determine the speed of the 0.3 kg pinball B just before the plunger strikes the stop, i.e., s = 0. Assume all sufaces of contact to be smooth. The ball moves in the horizontal plane. Note that the ball slides without rolling.

[A]. v = 4.47 m/s
[B]. v = 3.30 m/s
[C]. v = 2.34 m/s
[D]. v = 3.16 m/s

Answer: Option B

Explanation:

No answer description available for this question.

Jani Dhruvkumar said: (Aug 3, 2019)  
(1/2)(300)[(0+50)^2]

= (1/2)(300)[(100+50)^2] + (1/2)(.3+.25)(v^2).

V = 3.30m/s.

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