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gangrene

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Question 10 (1 point)

A child of mass 15.22 kG sitting on a swing whole length is 2.97

meters is pulled up an angle 42.9 degrees and released. The maximum

speed of the child during the subsequent motion (in Meters/sec) is?

Student response 3.98

Correct answer 1.26E0 (1.26 * 10^0 )

Score 0 / 1

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I tried solving this problem by energy conservation and setting max kinetic energy = max potential energy. I figure when the child swings back to equilibrium angle 0, the speed would be greatest with max kinetic energy and with 0 potential energy. The height I used for max potential energy was 2.97-2.97cos42.9 (L-Lcos42.9).

am I doing something wrong?

thx in advance