You drop a ball from the roof of the library with a mass of

) You drop a ball from the roof of the library with a mass of 0.20kg at height of 30m. Using the principle of conservation of mechanical energy, determine the velocity of the ball at impact with the ground.

Solution

the potential energy gets converted into kinetic energy

mgh = 0.5mv^2

v = sqrt(2gh)

v = sqrt(2*9.8*30)

= 24.25 m/s

so the velocity of the ball at impact with the ground will be 24.25 m/s