Insufficient information to determine engine output Steps:

• Calculate acceleration a = (25 - 20)/4 = 1.25 m/s².
• Net force for acceleration F_net = 900 × 1.25 = 1,125 N.
• Average speed v_avg = (20 + 25)/2 = 22.5 m/s.
• Power for acceleration = F_net × v_avg = 1,125 × 22.5 = 25 kW; engine power > this due to unstated resistance.

Why B is correct:

• Not enough information; resistance forces (drag, friction) required for total engine output, but assuming zero resistance yields ~25 kW, closest to B among options.

Why the others are wrong:

• A: Too low; perhaps miscalculated as force without velocity.
• C: Too high; perhaps used wrong acceleration like Δv/t without division.
• D: Too high; perhaps forgot 1/2 in KE or used full v² difference.

Final answer: B