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momentum = mass * velocity

1) a charging elephant

mass = 7500 kg

( http://en.wikipedia.org/wiki/Elephant )

velocity = elephants may reach 25 km/h

momentum = (7 500 kilograms) * 25 km/h = 52083 m kg / s

2) a jumbo jet sitting on the runway

velocity = 0

momentum = 0

3) Baseball traveling at 100 km/h

mass = 145 g

(http://hypertextbook.com/facts/1999/Chri…)

velocity = 100 km/h

momentum = (145 grams) * 100 km/h = 4.02 m kg / s

The charging elephant wins

PS: THIS IS NOT MY ANSWER! I FOUND IT ON Yahoo!

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