Answer:
5.4234 J
Explanation:
Kinetic energy, KE is given by [tex]0.5mv^{2}[/tex] where m is the mass of the ball, v is the velocity. The potential energy is also transformed to kinetic energy. Considering that potential energy is mgh but in this case part 1 had it as 2mgh then total kinetic energy at the bottom will be
[tex]m(2gh+0.5v^{2})[/tex] where g is acceleration due to gravity and its value is taken as 9.81, h is the height of string.
[tex]KE= 0.1\times 9.81\times 0.7\times 2+ (0.5\times 0.1\times 9^{2})=5.4234 J[/tex]
