1. a) A 50 kg kangaroo lands on one foot at a speed of 4m/s. This mechanical energy is momentarily stored in the Achilles tendons of the animal. If the tendon stretches 4 cm as the animal slows to a stop over a 20 cm vertical distance, a) find the elastic constant of the tendon b) with t=0 at the point of impact with the ground, write an equation for the stopping b) with t=0 at the point of impact with the ground, write an equation for the stopping motion of the kangaroo – treat the motion as simple harmonic- c) find the stopping time for the kangaroo

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