The data given in the question is,
m=7.8kg,h=8.1m,d=5m,=0.3,angle=36.87degree
Potential energy PE=mgh=7.8*9.8*8.1=619.2J
Frictional force =mgsink =7.8*9.8*sin(36.87)*0.3=14N
work done by friction=force* dstance=14*5=70J
work done by friction= change in total energy
work done by friction=change in KE+change in PE
Remaining energy to be converted to KE is, difference between work done by frictionand PE
Remaining energy to be converted to KE=619.2-70= 549.2 J
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