Physic Help!!!! find the speed of the person going down?

A 100 kg bike and rider are initial coasting at 1.5 m/s at the top of a 500m long hill with a 15 degree incline. uming an average friction force of 60N and that the rider does not peddle, find the speed of the biker half-way down (e.g. travelled 250 m )the hill. SOLVE USING ENERGY AND WORK EQUATIONS