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When startled, an armadillo will leap upward. Suppose it rises0.544 min first0.200 s, (a) what is its initial speed as it leaves the ground? (b)What is its speed at a height of0.544 m? (c) How much higher does it go?

Short Answer

Expert verified
  1. Initial speed of an armadillo when it leaves the ground is 3.70 m/s
  2. Speed of an armadillo at the height of 0.544 m is 1.74 m/s
  3. Armadillo goes higher to 0.154 m

Step by step solution

01

Given information

The given data can be listed below as,

Armadillo rises up to height y1=0.544m

Armadillo jump in timet1=0.200s

02

Understanding the kinematic equations

The problem deals with the kinematic equation of motion in which the motion of an object is described at constant acceleration. Using the second kinematic equation, the initial speed of an armadillo when it leaves the ground can be determined. Further, with the first kinematic equation, the speed of an armadillo at height of 0.544 m can be found. Finally, using the formula for the third kinematic equation, the vertical height of an armadillo can be calculated.

Formula:

The displacement in kinematic equation is given by

∆y=v0t+12at2

03

Determination of initial speed of armadillo

The first kinematic equation for vertical motion is

∆y=v0t+12at2

As the upward direction is taken as positive,

localid="1660879109444" y1-y0=v0t-12gt2v0=∆y+gt22t

04

Determination of speed of armadillo at height 0.544m

yf=v0+atv=v0-gtv=3.70m/s2-9.8m/s2×0.200sv=1.74m/s

Therefore, the speed of armadillo at height of 0.544 m is 1.74 m/s

05

Determination of speed of armadillo at height 0.544m

vf2=v02+2ay

Final velocity would be zero at the maximum height

0=v02-2ay2y2=3.7m/s229.8m/s2y2=0.698m∆y=0.698m-0.544=0.154m

Therefore, the armadillo goes 0.154 m higher.

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