# Calculating distance using spring constant, mass and velocity? (Really basic stuff )

by grbmrdj
Tags: basic, constant, distance, mass, spring, velocity
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 P: 1 Hi I have a physics exam tomorrow, and I just realized we haven't covered either impulse or spring constants, and about 1 1/2 hours left to study. From a practice exam, please someone help me out? 1. The problem statement, all variables and given/known data A high impact crash helmet is glued onto a floor and a 5.0kg steel ball is dropped from a certain height in the helmet padding. The ball hits the helmet padding at 0.85m/s. The spring constant of the padding amterial is 35kN/m. 2. Relevant equations distance = Force/spring constant(k) Most likely an impulse on as well 3. The attempt at a solution d=F/k impulse = mv = 5 x 0.85 = 4.25 d = 4.25 / 35000 = 1.2 x 10^-4 This one is not so important: Also, in a previous question, they gave a linear graph, at one point, N = 300 and displacement = 0.06 metres. Find the spring constant? I got k = f/d = 300/0.06 = 5000 N/m Is this right? (Couldn't find the answer's to the practice exam) Also, any tips on learning these in about 20 minutes? Thanks, and sorry for massive post.

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