PLEASE HELP A child and sled with a combined mass of 55.7 kg slide down a frictionless hill that is 11.3 m high at an angle of 29 ◦ from horizontal. The acceleration of gravity is 9.81 m/s2. If the sled starts from rest, what is its speed at the bottom of the hill?
Answer in units of m/s.

t.                 w               e                 n                   t                 y                 c             h               a           r           a               c                 t             e             r             s        

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

answer: 31, 5556. 952 seconds