Answer
$\bigtriangleup KE = -347.22KJ$
$\bigtriangleup PE = 441.450KJ$
Work Step by Step
$\large m=900kg;\large v_2 = 0;\large v_1 = 100km/hr = 27.77m/sec$
$\bigtriangleup KE = (1/2)*m*(v_2^2-v_1^2)$
$\bigtriangleup KE = (1/2)*900*(0^2-27.77^2)$
$\bigtriangleup KE = -347.22KJ$
$\bigtriangleup PE = mg(z_2-z_1$
$\large m = 900kg; g=9.81m/sec^2;z_2 = 50m;z_1=0m$
$\bigtriangleup PE = 900*9.81*(50-0) = 441.450kJ$
