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1. [#751] Exploding 1 point A mass breaks suddenly into two parts, masses M and m, with speeds I and v
respectively and carrying a total kinetic energy K. If ML = R = 4.2, what fractions of K does each of the
masses carry? (Think about significant figures.) a) M carries_ K . b) m carries K . Please se... 

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4. [#754a] Car crash forces 1 1 point I mg F.+ Two identical cars, mass 1.0 tonnes, travelling at 30.0 kph
in opposite directions, collide. During the collision, the front of each the cars crumples and becomes 15
cm shorter. So let's say that each car decelerates to rest over 15 cm. What is the magnitud... 

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7. [#756] Car crash forces 3 1 point In the wealthy suburbs of some cities, some people consider it
fashionable to fit large, rigid bars to the front of their vehicles. These are variously called bull bars,
pedestrian bars, cyclist crushers etc. (The vehicles thus decorated are often used to delive