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Homework Statement
Two trolleys, of mass 1.2 kg and 4.8 kg, are at rest with a compressed spring between them, held that way by a string tied around both. When the string is cut, the trolleys move apart, if the force constant fo the spring is 2400 N/m, by how much must it have been compressed in order that the 4.8 kg cart move off at 2.0m/s
Cart: 4.8 kg, 2 m/s
Cart 2: 1.2 kg
Spring constant, k: 2400 N/m
Homework Equations
Ee = 1/2kx^2
Ek = 1/2mv^2
The Attempt at a Solution
E = E'
1/2kx^2 = 1/2mv^2
kx^2 = mv^2
2400x^2 = 4.8(2)^2
x^2 = 4.8(4)/2400
x = 0.09 m