- #1
riseofphoenix
- 295
- 2
Why why why is Potential Energy equal to Kinetic Energy in this problem??
A 31.0 kg child on a 3.00 m long swing is released from rest?
when the ropes of the the swing make an angle of 28.0° with the vertical
(a) Neglecting friction, find the child's speed at the lowest position.____m/s
potential energy = kinetic energy
mgh = 1/2 mv2
0.35 * 9.8 = 0.5 v2
v = √(2*9.8*0.35)
v = 2.62 m/s (without friction)
^^^^^^^
Why did they set potential energy equal to kinetic energy? I don't understand :(
A 31.0 kg child on a 3.00 m long swing is released from rest?
when the ropes of the the swing make an angle of 28.0° with the vertical
(a) Neglecting friction, find the child's speed at the lowest position.____m/s
potential energy = kinetic energy
mgh = 1/2 mv2
0.35 * 9.8 = 0.5 v2
v = √(2*9.8*0.35)
v = 2.62 m/s (without friction)
^^^^^^^
Why did they set potential energy equal to kinetic energy? I don't understand :(