As shown in the picture, a man is biking from the top to the bottom of a hill. At the top of the hill, his speed is 1 m/s. When he reaches the foot of the hill, his speed increased to 10 m/s. During this process, 1500 J heat was produced by the man and dissipated to the environment. The height of the hill is 50 m. The weight of the man and his bike is 80 kg. Please compute the work done by the cyclist (W) and the internal energy change (ΔU).
