Homework Help: Physics

Posted by Anonymous on Thursday, May 31, 2012 at 11:53am.

a) While painting a 12 meter high roof you knock the paint brush off the edge, with no air resistance on the brush how long will it take to hit the ground?
b) What would the velocity of the brush be before it hit the ground?

Physics - Anonymous, Thursday, May 31, 2012 at 11:56am
*While painting on a 12 meter high roof,
Physics - Anonymous, Thursday, May 31, 2012 at 1:18pm
Please check
12m= (0m/s)+1/2(9.81m/s^2)(t^2)
12m= 0+(4.905m/s^2)(t^2)
t^2=12/4.905m/s^2
t^2= 2.45s^2
t= 1.565 s
t= 1.6 s
Physics - Anonymous, Thursday, May 31, 2012 at 1:21pm
Velocity
12/1.6 sec= 7.5 meters/sec down
Physics - Elena, Thursday, May 31, 2012 at 5:50pm
t= 1.565 s - correct
v =g•t =9.8•1.565 = 15.3 m/s

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