Describe the energy transformations that occur from the time a skydiver jumps out of a plane until landing on the ground.

The air that we breath is made mostly of which gaseous molecule

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?