By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?
A)159%
B)259%
C)359%
D)459%
E)The correct answer is not given.

Question

Quizplus · Accepted Answer

The energy stored in a spring is proportional to the square of its stretch (U = 1/2 k x^2). Increasing the stretch from 7 cm to 15 cm increases the energy by a factor of (15/7)^2, which is approximately 4.59, or a 359% increase.

By How Much Is the Energy Stored in a Hooke's