1)A stone fall from a height of 5m,Find the speed of the stone when is 3m from the ground.
2)Find the kinectic energy and potential energy at the same point if the stone has a mass of 2km
3)Repeat the same process 1.2m from the ground.
4)Resolve the kinetic energy and speed starting with kinematics

Question

1)A stone fall from a height of 5m,Find the speed of the stone when is 3m from the ground. 
2)Find the kinectic energy and potential energy at the same point if the stone has a mass of 2km 
3)Repeat the same process 1.2m from the ground. 
4)Resolve the kinetic energy and speed starting with kinematics

anonymous · Answer

use the kinematics equation where vyf^2=vyi^2+2*a*y(final-initial) initial velocity is zero

anonymous · Answer

partb) im not sure if you meant the stone has a mass of '2kg' instead of "2km"  so deltaE= deltak+deltaU so delta E=.5mv2f-.5mv2i+mghf-mghi=0 you know all the variables here so you can get potential and kinetic energies.