Answer:
112500 J
Explanation:
Kinetic energy, KE is given by
[tex]KE=0.5mv^{2}[/tex] where m is the mass of the school bus while v is the velocity
The change in kinetic energy is given by
[tex]0.5mv_f^{2}- 0.5mv_i^{2}[/tex] where the subscript f and i denote final and initial speeds
[tex]0.5*1000(0^{2}-15^{2})=-112500 J[/tex]
