1. The problem statement, all variables and given/known data A machine has a steel shuttle with mass m that is pulled along a vertically positioned square steel rail by a spring with a spring constant k. The shuttle is released when the spring acts on the shuttle with force equal to F at a 45 degree angle. a) what is the initial acceleration of the shuttle? b) what will be the acceleration of the shuttle after it moved a distance L? 2. Relevant equations F=ma ; X=vt+(1/2)at^2 ; u_k(n)=f_k ; 3. The attempt at a solution For A Ʃx= K*cos(45)-f_k=m_x*a Ʃy=K*sin(45)+N-mg=0 a= (kcos45-uk(mg-Ksin45))/m a= (t/m)(kcos45-ksin45)(uk*g) For B) Wouldn't it just be my a_1 subtracted by the new value of a? I was thinking since theta is going to change with the elastic band.