1. The problem statement, all variables and given/known data A block of mass 5kg is released from rest and slides down a distance D down a smooth plane inclined at 30◦ to the horizontal. It then strikes a spring compressing it 10cm before it begins to move up the plane. If the spring constant is 980 N/m and g=9.8m/s², find D. Solve Using the Principle of Conservation of Energy. 2. Relevant equations mgh=1/2kx² 3. The attempt at a solution I drew a diaghram of the problem and found the resultant forces on the block. Kinetic energy of the block= potential at the bottom of the spring. mgh=1/2kx² m=5 Kg, g=9.8 m/s² , h= Dsin30 (pythagoras theorem) , k= 980 N/m , x= 0.1m subbing into the formula (5)(9.8)(Dsin30)=1/2(980)(0.1) D=0.2 m is this the correct solution? it's an assignment so I'd like the method to be correct. Thanks in advance.