- #1
xregina12
- 27
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A 2kg ball is attached to a ceiling by a 3 m string. The height of the room is 5.4 meters. Acceleration due to gravity is: 9.8m/s^2. What is the gravitational potential energy relative to a point at the same elevation as the ball? Answer in units of J.
The way I set up the problem is:
y=-(5.4-3)=-2.4 meters
m=2kg
g=9.8m/s^2
PE=mgy=(2)(9.8)(-2.4)=-47.04 J.
however, i checked the answer in my book and it wasn't it. :(
anyone can help show me what I did or/understood wrong?
The way I set up the problem is:
y=-(5.4-3)=-2.4 meters
m=2kg
g=9.8m/s^2
PE=mgy=(2)(9.8)(-2.4)=-47.04 J.
however, i checked the answer in my book and it wasn't it. :(
anyone can help show me what I did or/understood wrong?