I got parts a and b but am having trouble getting part c and d. can someone please help me? thanks in advance!(adsbygoogle = window.adsbygoogle || []).push({});

Figure 8-40 shows an 8.00 kg stone resting on a spring. The spring is compressed 8.0 cm by the stone.

Fig. 8-40

(a) What is the spring constant?

9.8 N/cm by mg/x(compression)

(b) The stone is pushed down an additional 30.0 cm and released. What is the elastic potential energy of the compressed spring just before that release?

70.8 J by convert A to N/m then convert compression to m and then use .5kx^2 to get the answer

(c) What is the change in the gravitational potential energy of the stone-Earth system when the stone moves from the release point to its maximum height?

J gravitational potential energy is mgy but i don't know y

(d) What is that maximum height, measured from the release point?

m y=(.5mv^2)/mg I know i have to use this eqn. but i don't know v.

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# Homework Help: Stone resting on a spring

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