A spring with constant 72500.0 N/m is compressed 54.6 cm and used to launch a 109.0 kg physics student. The student starts decending down a 13.4 m high track that is frictionless until the student starts up the incline again. The student's coefficient of kinetic friction on the 28.5° incline is 0.129. What is the student's speed just after losing contact with the spring?
spring = 0.5kx2
The Attempt at a Solution
alright for this question i equated the mgh+0.5mv2 = 0.5kx2
and solved for v .... is this the wrong thinking for this question pls. help