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Homework Statement
1.2 kg cart slides down frictionless ramp from a height of 1.8m and then onto a horizontal surface where it has a head-on elastic collision with a stationary 2.0kg cart cushioned by an ideal Hooke's Law spring. Maximum compression of spring is 2.0 cm
Determine the spring Constant
Homework Equations
The Attempt at a Solution
Em1=Em2
mgh=1/2kx^2
But this did not get me the answer