A 50 kg student jumps on a pogo stick and compresses the stick's spring by 43 cm. If the student reaches a maximum height of 0.7 m above the compressed point on following jump, calculate the spring constant.
1/2 k x^2 = m g h ... k = 2 * m * g * h / x^2
k = 2 * 50 kg * 9.8 m/s^2 * .7 m / (.43 m)^2 = ? N/m