Answer:
See the explanation below
Explanation:
Due to the frictional force, this force acts in the opposite direction to the movement of the person's shoe. This force tends to wear the sole of any shoe. We must remember that the frictional force is defined as the product of the normal force by the coefficient of friction between surfaces.
For this case, it should be the coefficient of dynamic friction between the pavement and the material of the sole of the shoe
Momentum = (mass) x (speed)
Momentum = (12,000 kg) x (40 m/s)
Momentum = (12,000 x 40) kg-m/s
Momentum = 480,000 kg-m/s
B. a ceiling fan blows air
C. heat rises from a chimney
B) erosion
C) volcano
D) landslide