Answer:
3.43 J
Explanation:
One form of energy can convert to another but cannot be created or destroyed.
A body has potential energy due to its position or configuration.
P.E. = m g h
A body has kinetic energy due to its motion.
K.E. = 0.5 mv²
Mechanical energy is the sum of potential energy and kinetic energy and in the absence of any external forces, the mechanical energy remains conserved.
Potential energy+ Kinetic energy (at the top) = Potential energy +kinetic energy (at 3.25 m)
⇒ m g h + 0 = m g h' + K.E.'
⇒K.E. ' = mg (h -h') = 0.20 kg × 9.81 m/s² × (3.25 m - 1.5 m) = 3.43 J
