Posted by **anna** on Friday, February 25, 2011 at 4:52pm.

When a rattlesnake strikes, its head acceler-

ates from rest to a speed of 21 m/s in 0.46 s

seconds. Assume for simplicity that the only

moving part of the snake is its head of mass

200 g.

How much (average) power does the rat-

tlesnake need to accelerate its head that fast?

Answer in units of W.

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