Given that,
Mass = 2 kg
Height = 10 m
Speed = 1 m/s
We need to calculate the initial energy
Using formula of potential energy



We need to calculate the final energy
Using formula of kinetic energy

Put the value into the formula


We need to calculate the velocity when it is traveling 3 meters
Using conservation of energy


Put the value into the formula



Hence, The initial and final energy are 196 J and 1 J.
The speed of the particle is 7.76 m/s.