Question

A pogo stick has a spring with a force constant of 2.50 × 104 N/m , which can be compressed 11.2 cm. what maximum height, in meters above the compressed position of the spring, can a child jump with the stick using only the maximum elastic potential energy in the spring, if the child and stick have a combined mass of 44 kg?

Answer 1

h = 36.4 cm

Step-by-step explanation:

given,

spring constant = 2.5 x 10⁴ N/m

compressed distance = 11.2 cm = 0.112 m

mass of the child = 44 kg

maximum height = ?

by energy of conservation

`K.E_i +P.E_i= K.E_f + P.E_f`

`(1)/(2)kx^2 = mgh`

`(1)/(2)* 2.5 * 10^4 * 0.112^2 = 44* 9.8 * h`

`(1)/(2)* 2.5 * 10^4 * 0.112^2 = 44* 9.8 * h`

`156.8 = 44 * 9.8 * h`

`h = (156.8)/(44 * 9.8)`

h = 0.364 m

h = 36.4 cm