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FOR THIS QUESTION I FOUND B BUT I HAVE NO IDEA ON HOW TO FIND A.

A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 62 m/s (139 mi/h) when its tailhook grabs hold of the arresting cables. The cables bring the plane to a stop in a distance of 88 m.

(a) How much work is done on the plane by the arresting cables?

MJ

(b) What is the force (assumed constant) exerted on the plane by the cables?

kN opposite the plane's direction of motion

(Note: Both answers will be underestimates, since the plane lands with the engines full throttle forward; in case the tailhook fails to grab hold of the cables, the pilot must be ready for immediate takeoff.)

AND FOR THIS QUESTION I FOUND A BUT HAVE NO IDEA ON HOW TO FIND B.

A car with mass of 1000.0 kg accelerates from 0 m/s to 40.0 m/s in 12.0 s. Ignore air resistance. The engine has a 23% efficiency, which means that 23% of the thermal energy released by the burning gasoline is converted into mechanical energy.

(a) What is the average mechanical power output of the engine?

kW

(b) What volume of gasoline is consumed? Assume that the burning of 1.0 L of gasoline releases 47 MJ of thermal energy.

L