I'm not entirely sure how he got the 7000 J figure for the energy required to reduce a relative velocity of 1000 miles per hour to 0. If I'm not mistaken, the kinetic energy of a 70 kg person moving at that speed would be about 7 million joules (or 7000 kilojoules, in other words off by a factor of 1000), which is the energy in 1.7 kg of TNT. For comparison, a can of cola contains about 630 kilojoules, so you'd need to drink 11 cans of cola rather than just a sip (and turn that energy losslessly into force, which is a problem) (that would, by the way, be about 4 kilograms of cola). (all according to Wolfram|Alpha)