L = 1/2 m (vf^2 - vi^2) = 1/2 * 950 * (25^2 - 10^2) J =
= 475 * 525 J = 249375 J
36 Km/h = 36/3.6 m/s = 10m/s
90 km/h = 90/3.6 m/s = 25m/s
Ec1 = 1/2mv^2 = 1/2*950*10^2 = 47.500 J
Ec2 = 1/2mv^2 = 1/2*950*25^2 = 296.875 J
DELTA E = (Ec2 - Ec1) = (296.875 - 47.500)J = 249.375 J = 2.49*10^5 J
Ciao!