so for part a you would use PE=1/2kx^2 and input k with 2300N/m and x with the displacement of 15cm?
and for part b would PE=KE so to find v because if PE doesn't equal KE then there will be two variables in the KE=1/2mv^2 equation and then you won't be able to find velocity.
also thanks for...
Homework Statement
A person places a 2.2kg truck against a horizontal spring (k=2300N/m) on a frictionless horizontal surface. The spring is compressed 15cm and released.
a) How much energy is stored in the spring just before the truck is released?
b) What is the velocity of the truck...