1.15. A car is travelling along a straight road with speed v measured in m/s. The power P measured in watts required to overcome external
forces opposing the motion is given by the P = cv + kv3
where c and k are constants. Use base units to obtain an S. I. unit for
constant k.

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.