Answer:
Velocity= 19.05 m/s
Kinetic energy= 3.08 J
Explanation:
The corn possess potential energy. Feom law of conservation of energy, all the potential eneegy will be converted to kinetic energy, with negligible friction.
Potential energy, PE= kinetic energy, KE
Potential energy is given by mgh while kinetic energy is given by
Equating
Making v the subject of the formula then
Substituting 9.81 m/s2 for g and 18.5 m for h then the velocity will be
To get the kinetic eneegy, since PE=KE AND KE is
Substituting v with 19.05 and m with 0.017 kg we have
This can also be achieved by mgh since PE=KE hence 0.17*9.81*18.5=3.085245 J and the results are slightly different due to small energy losses and rounding off of values.