a spring with a spring constant of 500 N/m is used to propel a 0.5 kg block up an inclined plane. the spring is compressed 30 cm and launches block across frictionless surface onto inclined plane of 25° and 4 m long. the plane kinetic friction is 0.35.A find highest point on incline.B. Find the external work done.C. find initial elastic potential energy in compressed spring. D. find increase in thermal energy of system.e. find final speed of the block.is the gravitational force of the earth on the block conservative or nincinservative?