# physics

A spring whose spring constant is 450 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.500 kg ball when released?

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1. 1/2 m v^2=1/2 k x^2
v=sqrt(kx^2/m)

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bobpursley
2. A 550 N crate rests on the floor. How much work in joules is required to move it at constant speed 7.0 m along the floor, against a friction force of 150 N?

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