Chris jumps off a bridge with a bungee cord (a heavy stretchable cord) tied around his ankle, (Figure 1). He falls for 15 m before the bungee cord begins to stretch. Chris's mass is 80.0 kg and the cord stop his fall (momentarily) after he has fallen a distance of 59.0 N/m m from the bridge. Calculate Chris's gravitational potential energy when the cord just begins to stretch (position b), relative to: the bridge (position a), the stopping point (position c).

0.19 m/s and 0.45 m/s

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.