An \"energy bar\" contains 21 g of carbohydrates. If the energy bar was his only

Question

An "energy bar" contains 21g of carbohydrates.
If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr?
Express your answer using two significant figures.
Answer must be in METERS. An "energy bar" contains 21g of carbohydrates.
If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr?
Express your answer using two significant figures.
Answer must be in METERS. An "energy bar" contains 21g of carbohydrates.
If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr? If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr?
Express your answer using two significant figures.
Answer must be in METERS.

Explanation / Answer

1 gm of Carbohydrates contains : 1 gram = 4 calories

1 cal = 4.2 J

total energy in bar = 21x4.2x4

= 352.8 J

Total kinetic energy required to move the 68 Kg man at a speed of 5 km/hr(or 1.39 m/sec) = 0.5x68x1.39x1.39

= 65.69 J

Total time till man can move = 352.8/65.69

= 5.37 sec

Total distance moved "VxT"= 1.39x5.37

= 7.46 m

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