Question

A car resting at W has a maximum PE of 7000J.
Answer in one sentence
a. If the PE at Y is 3000J, what will be its KE at Y?
b. What is the mechanical energy at points W, X, Y, Z?
c. State the law which helped you to arrive at the above answer

Answer 1

Answer:

ANSWER

∵KE=21mω2(a2−x2)

where x is the displacement of the particle, a is the amplitude.

and PE=21mω2x2

Now if K.E=P.E

then, 21mω2(a2−y2)=21mω2y2

⇒21mω2a2−21mω2y2=21mω2y2

⇒21mω2a2=21mω2y2+21mω2y2

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