(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

1. A 95 g arrow is shot by a bow from ground height such that it is moving at 25m/s at a height of 25m. Ignore air resistance.

a) What was the launch speed?

b) How much work did the bow do on the arrow?

m=95g (.095 kg)

V2= 25m/s

d=25m

t=1 s

2. Relevant equations

Ek= ½ mv(squared)

W= deltaE= Fapp(d)

3. The attempt at a solution

a) The launch speed was either 0m/s OR 25 m/s.

b) Ek= ½ mv(squared)

= ½ (0.095)(25)2

=1.1875

W= deltaE= Fapp(d)

= 1.1875(25)

= 29.69 J

* i cant figure out whether the 25m/s is the v2. or is it irrelevant and i should assume v1=0m/s. this is gr. 11 stuff, any suggestions?

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# Homework Help: Work+ Nrg! gr.11 problems

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