Physics Word Problem

label Physics
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A 7 kg block hangs 1.2 m from the ground. It falls at an acceleration of 4.06 m/s^2. It strikes the ground and does not bounce. How long does it take the 7 kg block to hit the ground in s.

Gravity = 9.8 m/s^2

Jun 21st, 2015

Thank you for the opportunity to help you with your question!

m = 7kg                       F=ma=w = 70N

h= 1.2 m

a= v/t


g = 9.8

h= v t+ 1/2gt^2 

h= a* t^2 + 1/2g*t^2

1.2= t^2 ( a+1/2 g )

1.2= t^2 (4.06+ 1/2 * 9.8 ) 

t^2= 0.13

t= 0.36 sec

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 21st, 2015

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