ap physics
posted by anna .
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.

m = 0.2 kg
Ke = (1/2) m v^2 = work done = power*time
so
power = [(1/2) m v^2] / .46 Watts