HELLO DEAR,
GIVEN:-
MASS (m) = 9000kg
kinetic energy (k) = 18000j
we know :-
k = 1/2 mv²
therefore,
18000 = 1/2 × (9000) × v²
v² = [tex]\bold{\frac{18000 \times 2}{9000}}[/tex]
v² = 36/9
v² = 4
v = 2m/s
hence, option (A) is correct,
I HOPE ITS HELP YOU DEAR,
THANKS