If a vector that is 3cm long represents 30 km/h, what velocity does a 5 cm long vector which is drawn using the same scale represent? A.50 km/h
B. 60 km/h
C. 100 km/h

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.