Question

A 24 kg child descends a 5.0 m high slide and reaches the ground with a speed of 2.8 m/s.  
a.     How much  energy was dissipated due to friction in the process?
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Answer 1

initial PE = mgh
final KE = 1/2 mv^2
subtract to find energy loss due to friction

Answer 2

Would it be 1081.92 J